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Slow Cooker Minestrone Soup

Slow Cooker Minestrone Soup

Slow Cooker Minestrone Soup is a creamy, comforting bowl of vegetables, pureed white beans, and savory broth that makes an easy weeknight dinner. With bright tomatoes, tender zucchini, and fragrant herbs, this recipe delivers layered flavor and cozy textures. Make it for cold evenings or batch cook for a simple, nourishing meal the family will request again and again.
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Prep Time 15 minutes
Cook Time 45 minutes
Total Time 1 hour
Course Soups
Cuisine Italian
Servings 8 servings
Calories 250 kcal

Equipment

  • Slow Cooker
  • Blender
  • Large Nonstick Skillet
  • Large Pot
  • Instant Pot

Ingredients
  

  • 115 ounce can white beans, drained, rinsed (cannellini or navy) Drained and rinsed to remove packing liquid and excess sodium; provides creamy texture and plant-based protein to the soup. Adds body and a mild, nutty flavor that complements the broth and vegetables. Helps thicken the stew slightly as it simmers, blending with starches from pasta and vegetables.
  • 32 oz container reduced sodium chicken broth, or vegetable broth for vegetarians Reduced sodium broth supplies a savory, liquid base while keeping overall salt under control for dietary flexibility. Offers depth of flavor and umami that ties together beans, tomatoes, and vegetables without overpowering them. Can be substituted with vegetable broth to maintain a vegetarian profile without changing cooking method.
  • 2 tsp olive oil Lightly coats the pan for sautéing aromatics, helping to soften onion, carrots, and celery while contributing subtle richness. Adds healthy fats that carry flavor compounds from garlic and herbs into the broth. Prevents sticking during the initial stovetop step before slow cooking.
  • 1/2 cup chopped onion Chopped onion provides sweet and aromatic foundation when softened, building savory complexity in the soup. Releases moisture and natural sugars that balance the acidity of tomatoes and the bitterness of greens. Enhances mouthfeel and integrates with other aromatics during long, slow cooking.
  • 1 cup diced carrots Diced carrots contribute natural sweetness and texture, offering a tender bite after slow cooking. Add bright color contrast and nutritional value, including beta-carotene and fiber. Help create a balanced vegetable profile that complements beans and pasta.
  • 1/2 cup diced celery Diced celery brings subtle vegetal, slightly bitter notes and crunchy texture that mellow during cooking. Supplies aromatic depth and moisture to the mirepoix base, supporting the overall savory framework. Works with onion and carrots to form classic flavor building blocks.
  • 2 garlic cloves, minced Minced garlic delivers pungent, aromatic intensity that mellows into a warm, savory background during cooking. Releases savory compounds that enhance umami and pair well with tomatoes and herbs. Should be added early to bloom its flavors in the oil.
  • 128 oz can petite diced tomatoes Petite diced tomatoes add bright acidity, fruity sweetness, and body to the broth, creating the classic tomato base of minestrone. Provide texture with small tomato pieces that break down slightly during long cooking, enriching the soup. Balance the creaminess of beans and starchiness of pasta.
  • Parmesan cheese rind, optional Parmesan cheese rind infuses the broth with deep umami and salty, savory complexity when simmered and removed before serving. Releases gelatinous and cheesy notes that elevate the soup’s richness without melting into it. Optional but effective for developing a more layered, savory stock.
  • 1 fresh rosemary sprig Fresh rosemary sprig contributes piney, resinous aromatics that perfume the soup subtly during slow cooking. Adds herbaceous complexity that pairs well with tomatoes, beans, and cheese rind when left in whole for easy removal. Should be removed before serving to avoid overpowering small bites.
  • 2 bay leaves Bay leaves impart gentle, herbal-lorbeer depth that rounds and elevates the broth’s overall flavor during a long simmer. Add subtle notes of earthiness and aroma that help unify other seasonings. Are intended to be removed prior to eating.
  • 2 tbsp chopped fresh basil Chopped fresh basil brings bright, peppery-sweet herbaceousness when stirred in near the end of cooking for freshness. Enhances tomato flavors and adds aromatic lift to the finished soup. Helps provide a vibrant contrast to the deeper, slow-cooked notes.
  • 1/4 cup chopped fresh Italian parsley Chopped fresh Italian parsley offers clean, slightly peppery green flavor and visual freshness when added toward the end of cooking. Contributes mild herbal brightness that lightens the soup’s richness. Adds a fresh garnish-like quality while boosting micronutrients.
  • 1/2 tsp kosher salt and fresh black pepper Kosher salt and fresh black pepper season and balance flavors, with salt enhancing overall taste and pepper adding mild heat and aroma. Use measured salt to avoid oversalting, especially with broth and cheese rind contributing sodium. Black pepper finishes with subtle warmth when freshly ground.
  • 1 medium zucchini, 8 oz each, diced Diced medium zucchini provides tender vegetable texture and mild, slightly sweet flavor that absorbs surrounding broth flavors. Adds moisture and lightness while contributing vitamins and fiber to the soup. Holds shape well enough during slow cooking without becoming mushy if not overcooked.
  • 2 cups chopped fresh, or frozen defrosted spinach Chopped fresh or defrosted spinach supplies vibrant green color, nutrition, and tender leafy texture when stirred in near the end of cooking. Adds iron, vitamins, and a mild earthy flavor that complements beans and pasta. Wilts quickly and integrates into the soup without overwhelming other ingredients.
  • 2 cups cooked small pasta such as ditalini, al dente (or GF pasta) Cooked small pasta adds satisfying chew and body, contributing starch that slightly thickens the soup and makes it heartier. Should be cooked al dente to prevent over-softening when combined with hot broth and reheating. Allows the soup to serve as a complete, comforting meal.
  • extra parmesan cheese for garnish, optional Extra Parmesan cheese for garnish provides salty, nutty finishing flavor and a satisfying umami boost when sprinkled atop bowls before serving. Adds a creamy, savory accent that enhances each spoonful and complements the Parmesan rind used in cooking. Optional for those who prefer a cheesier finish.

Instructions
 

  • Puree beans with 1 cup of the broth in a blender. Heat oil in a large nonstick skillet over medium-high heat. Add the carrots, celery, onion, garlic and saute until tender and fragrant, about 15 minutes.: The moment you blend the white beans with a bit of broth the mixture becomes luxuriously smooth, releasing a faint bean aroma that signals creaminess to come. You want a silky texture, not grainy bits, so blend until fully uniform. If the purée seems too thick, add a splash more broth, a tablespoon at a time, to reach a spoonable consistency. A common mistake is overfilling the blender which can cause splatter, so pulse and hold the lid firmly. This purée enriches the soup body without any cream, creating a velvety base you will taste in every spoonful.
  • Transfer to the crock pot along with the remaining broth, tomatoes, pureed beans, parmesan cheese rind, salt and pepper. Add the rosemary, bay leaves, basil and parsley, cover and cook on low for 6 to 8 hours.: Once the olive oil shimmers, it’s releasing aroma and is hot enough to gently sizzle vegetables. You should hear a soft hissing as you add ingredients, which helps evaporate moisture and encourages caramelization. If the oil smokes, lower the heat slightly, since burning the oil creates a bitter flavor. Preheating the pan ensures even cooking and prevents the onion and carrots from sticking, so be patient and let the oil come to temperature before adding anything.
  • Forty minutes before the soup is done cooking, add zucchini and spinach. Cover and cook 30 more minutes. Remove bay leaves, rosemary sprig, parmesan rind and season to taste with salt and black pepper. Ladle 1-1/4 cups soup into 8 bowls with 1/4 cup pasta in each and top with extra parmesan cheese if desired.: As you sauté the carrots , celery , and onion , watch for the vegetables to soften and the edges to pick up light color. The pan should fill with a sweet, savory aroma, and the minced garlic will become fragrant without burning. Stir regularly to ensure even cooking and deglaze any fond with a splash of broth if bits start to stick. Avoid rushing the process by increasing heat too much, because quick browning can mask the delicate sweetness you want to develop.
  • Puree beans with 1 cup of the broth in a blender. Heat oil in a large pot over medium-high heat. Add the carrots, celery, onion, garlic and saute until tender and fragrant, about 15 minutes.: When you move the sautéed vegetables into the slow cooker, you’ll notice the aroma evolves as they meet the coolness of the broth and tomatoes . The Parmesan cheese rind will slowly release savory notes during the long cook, deepening the flavor in a way you can smell only after several hours. Make sure to scrape the skillet and add any browned bits, they’re full of flavor. A common error is over-salting at this stage, since reduction during cooking concentrates salts; err on the side of light seasoning and adjust later.
  • Add the remaining broth, tomatoes, pureed beans, parmesan cheese rind, salt and pepper. Add the rosemary, bay leaves, basil and parsley, cover and cook on low 40 minutes. Add the zucchini and spinach, cover and simmer until the zucchini is tender, about 8 to 10 minutes.: As the pot simmers slowly, the herbs will infuse the broth with layered aromatics. The rosemary will lend resinous brightness while the bay leaves add subtle savory depth, and the basil and parsley will mellow into a cohesive herbal backdrop. You should notice the aroma of herbs deepening through the house as the hours pass. Avoid lifting the lid frequently, because that releases steam and extends cooking time, and be careful not to let the pot go dry.
  • Remove the bay leaves, rosemary sprig, parmesan rind and season to taste with salt and black pepper. Ladle 1-1/4 cups soup into 8 bowls with 1/4 cup pasta in each and top with extra parmesan cheese if desired.: Adding the zucchini and spinach later preserves their color and texture, so they remain vibrant and tender rather than mushy. When you stir them in, listen for a gentle subsiding of the bubbling and watch the greens quickly wilt into the broth. If added too early, these vegetables will become overcooked and lose their visual appeal and fresh flavor, so time this step carefully to keep bright contrast in the bowl.
  • Puree beans with 1 cup of the broth in a blender. Press saute in the Instant Pot and heat oil. Add the carrots, celery, onion, garlic and saute until tender and fragrant, about 10 minutes.: During this short final burst, the flavors marry and the newly added vegetables soften just enough. You should see the broth subtly thicken as the puréed beans integrate, creating a slightly creamy suspension. Stir once or twice to ensure even cooking. Avoid leaving it unattended if your cooker runs hot, as some models finish faster than others and you might end up with overly soft pasta if added earlier.
  • Add the remaining broth, tomatoes, pureed beans, parmesan cheese rind, salt and pepper. Add the rosemary, bay leaves, basil and parsley, cover and cook high pressure 20 minutes.: Pulling out these whole aromatics prevents an overly woody or bitter bite, leaving behind their balanced flavors. Taste the soup and adjust seasoning gradually, because the Parmesan cheese can bring extra saltiness even after removal. A typical mistake is to over-salt at the end; always taste before adding more and remember you can always correct but hardly reverse excess salt.
  • Quick release, add the pasta, zucchini and spinach and cook high pressure 4 minutes. Quick release so the pasta doesn't overcook.: When serving, present each bowl with the right ratio of broth to pasta so the texture stays pleasing. The finished soup should show bright vegetable colors, a slightly thickened broth, and a sprinkle of Parmesan cheese that melts lightly on top. If the pasta absorbs too much liquid, serve slightly less pasta and offer extra broth at the table. A common serving mistake is overcrowding bowls which cools the soup quickly, so serve promptly and enjoy while warm.
  • Remove the bay leaves, rosemary sprig, parmesan rind and season to taste with salt and black pepper. Ladle 1-1/2 cups soup into 8 bowls and top with extra parmesan cheese if desired.: Blending the white beans a second time for different cooking methods ensures consistent texture. You should still aim for a smooth, velvety purée. If doing this step again for an alternate method, adjust the viscosity with broth so it integrates smoothly later. Over-thinning will reduce the creamy body, while under-blending leaves grainy bits, so find the middle ground.
  • Heat oil in a large pot over medium-high heat: Warming the oil in a heavy pot prepares a different method that gives similar starting aromas. The pot should be hot enough to produce gentle sizzling when you add vegetables, which helps concentrate their flavors. If the pan is too cool the vegetables will stew rather than sauté, leading to a less developed base. Conversely, too hot and you risk burning delicate garlic .
  • Add the carrots, celery, onion, garlic and saute until tender and fragrant, about 15 minutes: In this stovetop variation, watch the vegetables take on a glossy sheen and sweet perfume. Use a wooden spoon to scrape up any fond which intensifies the broth once deglazed. One pitfall is crowding the pot, which traps steam and prevents browning, so give the vegetables room to cook evenly.
  • Add the remaining broth, tomatoes, pureed beans, parmesan cheese rind, salt and pepper: Bringing these elements together in a pot allows the flavors to meld more rapidly than a slow cooker. You will notice the aroma shift as the tomatoes and Parmesan cheese mingle with the puréed beans . Simmer gently to avoid breaking down the vegetables too quickly. A common oversight is boiling vigorously which can make the soup cloudy and tougher in texture.
  • Add the rosemary, bay leaves, basil and parsley, cover and cook on low 40 minutes: Simmering for this period lets the herbs infuse without becoming overpowering. The kitchen will fill with a layered, herbaceous scent that indicates the pot is on track. Maintain a low simmer; too high a heat can volatilize the delicate herb oils and flatten the flavor profile.
  • Add the zucchini and spinach, cover and simmer until the zucchini is tender, about 8 to 10 minutes: At this stage the vegetables should become tender but still hold shape, offering a pleasant bite. Watch the zucchini for visual cues, small flecks turning translucent at the edges signal tenderness. Overcooking here yields a mushy texture and muted flavors, so aim for the shorter end of the timing if you prefer a bit of firmness.
  • Remove the bay leaves, rosemary sprig, parmesan rind and season to taste with salt and black pepper: Final seasoning is where the soup finds its balance. Taste, then add salt in small increments if needed, and finish with a few cracks of black pepper . If the soup tastes flat, a squeeze of lemon juice can brighten it, but be cautious not to introduce new ingredients that are not part of the recipe.
  • Ladle 1-1/4 cups soup into 8 bowls with 1/4 cup pasta in each and top with extra parmesan cheese if desired: Plate each bowl mindfully so the colors and textures present well. The warm Parmesan cheese garnish will melt into the broth and add a final savory touch. Serve promptly to preserve the intended contrast between broth and pasta .
  • Puree beans with 1 cup of the broth in a blender: For the Instant Pot variant, the bean purée step remains crucial. Achieve a consistent, silky purée and adjust thickness as needed, because this will influence the finished soup’s richness. Avoid leaving large bean fragments which can alter mouthfeel.
  • Press saute in the Instant Pot and heat oil: Using the Instant Pot’s sauté function concentrates flavors quickly by promoting gentle browning. You will hear an audible change as the pot transitions from cool to hot, and you should smell the aromatics come alive. Be careful with the setting, since overheating can trigger burn warnings or scorch delicate ingredients.
  • Add the carrots, celery, onion, garlic and saute until tender and fragrant, about 10 minutes: The saute setting accelerates the sweat of vegetables; look for softened edges and a sweet, savory perfume. Stir frequently to prevent hotspots and ensure even color. A common misstep is leaving the lid on while sautéing, which traps steam and prevents proper browning.
  • Add the remaining broth, tomatoes, pureed beans, parmesan cheese rind, salt and pepper: After adding liquids, scrape the pot bottom to lift any caramelized bits, they add depth during pressure cooking. The mixture will steam and blend rapidly under pressure, creating a cohesive broth. If you notice stuck bits before sealing, add a little extra broth and deglaze to prevent the Instant Pot from showing a burn alert.
  • Add the rosemary, bay leaves, basil and parsley, cover and cook high pressure 20 minutes: Sealing and cooking under high pressure extracts flavors efficiently. You will notice the pot settle and then begin to hum quietly, a sign the ingredients are marrying under pressure. Allowing the full time ensures beans and vegetables are tender throughout, but avoid overcooking delicate items that will be added later.
  • Quick release, add the pasta, zucchini and spinach and cook high pressure 4 minutes: A quick release prevents overcooking before you add tender items. Adding pasta , zucchini , and spinach at this point ensures they do not turn to mush in prolonged pressure. Overfilling the pot at this stage can cause uneven cooking, so be mindful of capacity limits.
  • Quick release so the pasta doesn't overcook: Releasing pressure quickly stops residual heat from turning pasta into a soft blob. Listen for the gentle whoosh and then open the lid carefully away from your face to avoid steam. A common mistake is neglecting to monitor the pasta timing which leads to a loss of pleasant chew.
  • Remove the bay leaves, rosemary sprig, parmesan rind and season to taste with salt and black pepper: The final cleanup step polishes the soup, removing woody bits and letting you tailor salt and pepper precisely. Taste and adjust incrementally, and consider a final drizzle of olive oil if the broth feels flat. Remember that serving temperature affects flavor perception, so taste warm, not scalding hot.
  • Ladle 1-1/2 cups soup into 8 bowls and top with extra parmesan cheese if desired: For the Instant Pot method the serving volume can vary slightly, so aim to portion evenly with warm bowls. Garnish with a shave of Parmesan cheese that will gently melt and add a pleasant salty finish. Serve immediately to enjoy the full range of temperatures and textures.

Notes

  • Use vegetable broth for vegetarian version: Swapping the chicken broth for a good quality vegetable broth keeps depth while making the soup vegetarian friendly. Look for reduced sodium to control final seasoning, and taste late to avoid over salting.
  • Choose canned beans wisely: Rinse and drain the white beans to remove canning liquid which can taste metallic. Puréeing part of the beans will thicken the broth naturally, so you can skip cream without losing silkiness.
  • Timing for pasta: Cooked pasta added at serving prevents clumping and over absorption. If you prepare pasta ahead, toss it with a little olive oil to keep pieces separate and portion into bowls just before ladling hot soup.
  • Herb handling: Add delicate herbs like basil toward the end to keep bright flavor, while sturdier herbs such as rosemary are best added early then removed before serving to control intensity.
  • Parmesan rind trick: Tuck a Parmesan cheese rind into the pot during cooking for umami depth, then remove before serving to avoid grating rind fragments into the bowl.
  • Adjusting thickness: For a thinner broth add a splash of broth when reheating, for a creamier mouthfeel blend more of the white beans into a purée and stir it in gradually.
  • Storage and reheat: Store leftovers separately from cooked pasta if possible. Reheat gently on the stove and add pasta just before serving to maintain texture and prevent mushiness.
Keyword easy minestrone soup, slow cooker minestrone, vegetable bean soup, weeknight slow cooker soup