Instant Pot Broccoli Cheddar and Zucchini Soup
Instant Pot Broccoli Cheddar and Zucchini Soup is a creamy, comforting bowl that combines tender broccoli and zucchini with sharp cheddar cheese for an easy weeknight dinner. The pressure cooking intensifies flavors while keeping prep minimal, resulting in a rich, velvety texture and bright herb notes of thyme. Make this when you want fast, satisfying comfort that still feels wholesome.
Equipment
- Instant Pot
- Blender
Ingredients
- 2 tablespoons extra virgin olive oil Enhance flavor and prevent sticking by sautéing aromatics and vegetables in a fruit-forward, peppery oil that withstands medium-high heat; adds a subtle richness and healthy fats to the soup base.
- 3 tablespoons butter Enrich the soup with a creamy, silky mouthfeel and help brown vegetables during sautéeing; contributes buttery depth and helps emulsify the finished broth.
- 1 small yellow onion, chopped Provide a sweet, savory foundation when chopped and softened, releasing sugars and aromatic compounds that build complexity in the soup's base.
- 1 carrot, chopped Add a mild sweetness and textural contrast when chopped and softened; contributes natural sugars that balance savory and cheesy elements.
- 2 medium zucchini, chopped Contribute a tender, slightly grassy texture and mild flavor when chopped; absorb broth and meld with other vegetables to create body in the soup.
- 2 tablespoons fresh thyme leaves, plus more for serving Introduce an herbaceous, aromatic note by releasing oils when cooked; elevates overall flavor and pairs particularly well with dairy and vegetables.
- 1/4 teaspoon freshly grated nutmeg Lend warm, slightly sweet and nutty undertones when freshly grated; enhances savory flavors and complements the creaminess of milk and cheese.
- 1/4 teaspoon cayenne, or more to taste Provide a gentle heat and smoky warmth when measured to taste; brightens flavors and adds a subtle kick without overpowering the dish.
- kosher salt and pepper Season and balance the soup by enhancing savory flavors and controlling bitterness; use to taste to bring out aromas and round out the profile.
- 3 cups low sodium veggie or chicken broth Build a flavorful liquid base and deglaze the pot, providing seasoning and depth while allowing vegetables to cook evenly under pressure.
- 4 cups broccoli florets Add a fresh, slightly bitter, and vegetal character that contributes bulk and nutritional value; breaks down under heat to thicken and flavor the soup.
- 2 bay leaves Impart subtle herbal, slightly floral notes while infusing the broth with complexity; remove before serving to avoid overpowering the finished soup.
- 1 cup whole milk Contribute creamy body and a mild dairy sweetness that smooths textures and tempers sharpness from cheese; stir in gently to avoid curdling.
- 2 -3 cups shredded sharp cheddar cheese Deliver sharp, tangy, and savory intensity when shredded and added slowly; melts into the soup to create a classic, cheesy finish and thickens the texture.
Instructions
- Set Instant pot to sauté. Add the butter, olive oil, and onion, cook 5 minutes or until fragrant. Add the carrots, zucchini, thyme, nutmeg, cayenne and a large pinch each of salt and pepper. Pour in the broth. Add the broccoli and bay leaves. Cover, select the manual setting, and cook on high pressure for 8 minutes.: The pan releases an immediate savory scent as the butter and extra virgin olive oil warm, creating a glossy surface for the onion to soften. You should hear a light sizzle as the chopped onion hits the fat and see their edges turn translucent, which signals the sugars are breaking down into sweet, aromatic notes. This step matters because the caramelized onion base deepens the overall flavor profile; skipping it leads to flatter tasting soup. A common mistake is using too high heat, causing the butter to brown and introduce bitter flavors, so keep the sauté setting gentle and stir frequently to prevent sticking.
- Once done cooking, use the quick release function and release the steam. Carefully remove the bay leaves and discard. Transfer the soup to a blender and pulse until chunky smooth (not totally puréed). Return to the instant pot.: As the butter melds with the oil, the kitchen fills with a warm, inviting aroma. You will see the onion pieces lose their raw white sheen and start to soften, emitting a faint sweetness. This gentle cooking lets the carrot and zucchini you add next integrate more seamlessly into the broth. If you rush this and add liquid too soon, the aromatics will remain underdeveloped and the soup tastes less layered.
- Set the Instant pot to sauté. Stir in the milk and cheese, and cook 5 minutes or until the cheese has melted. Ladle the soup into bowls and top with fresh thyme. Enjoy!: The carrot brings a bright, sweet scent, while the zucchini adds a greener, softer note; together they change the pot's fragrance. Fresh thyme releases citrusy herbal oils when stirred, and the freshly grated nutmeg gives a faint warm complexity. You will notice a slight hiss as the spices meet the warmed fat, which helps bloom their flavors. This stage builds aromatic contrast and balancing seasoning, so measure the cayenne cautiously; too much will dominate the vegetable character.
- Pour in the broth: Adding the broth transforms the pan from sauté to simmer, and an immediate refreshing steam will rise. The liquid deglazes the pan, lifting browned bits and folding those flavors into the soup. This matters because those fond bits carry concentrated taste, and skipping a proper deglaze leaves flavor stuck to the pot. Stir well to scrape the bottom, ensuring no burnt residue remains which could create off flavors during pressure cooking.
- Add the broccoli and bay leaves: When the broccoli hits the warm broth, it blooms with color and the pot emits a fresh, green aroma. Bay leaves infuse a layered herbal background while they simmer under pressure. Adding the broccoli at this point guarantees it cooks through while retaining character; if added too late, the florets may not soften evenly. Remember to remove bay leaves before serving to avoid an unpleasant bite.
- Cover, select the manual setting, and cook on high pressure for 8 minutes: The pressure cook seals in aromas, and the gradual building of pressure concentrates the flavors, producing a fuller, more integrated broth. You will notice a gentle hum as the pot reaches pressure, and the timing yields tender but still vibrant broccoli and vegetables. This technique is crucial for extracting deep vegetable flavor quickly; undercooking will leave texture too firm, and overcooking can make the vegetables mushy.
- Once done cooking, use the quick release function and release the steam: When you quick release, expect a rush of fragrant steam and a pop as the valve drops, which indicates it is safe to open. This rapid pressure drop helps prevent overcooking and preserves a brighter vegetable color and slightly firmer texture. A common issue is forgetting to stand back from the steam, which can lead to burns, so always use a long utensil and keep your face and hands clear.
- Carefully remove the bay leaves and discard: After opening the pot, the bay leaves will be easy to spot and pull out, leaving a subtly seasoned broth behind. Removing them prevents any fibrous pieces from making it into the blended soup. If you leave them in, small leaf fragments can create an unpleasant texture, so check carefully around the florets and in the liquid.
- Transfer the soup to a blender and pulse until chunky smooth: Blending transforms the textures, smoothing the broth while allowing small bits to remain for a pleasing body. You should hear a steady whir and see the mixture become uniformly creamy with lovely flecks of green. The goal is not a purée, but a velvety consistency that still reads as vegetable forward. Overblending can remove all textural interest, so pulse and check often to preserve some character.
- Return to the instant pot: Bringing the blended soup back into the pot keeps it warm and ready for the final finishing stage. The returned heat helps the flavors marry, and the pot provides direct, even heat for the cheese to melt without scorching. If you were to finish in a separate pan, temperature control might be less steady, which could risk the dairy separating.
- Set the Instant pot to sauté: Re warming the soup creates gentle movement and a soft simmer, ideal for incorporating milk and cheddar cheese . You will see tiny bubbles forming at the edges and smell a deeper, richer aroma as the dairy warms. This controlled heat is important to avoid curdling; too high heat can cause separation, turning the soup grainy instead of silky.
- Stir in the milk and cheese, and cook 5 minutes or until the cheese has melted: As you stir, the milk adds sheen and the cheddar cheese slowly dissolves into the hot base, releasing that signature savory, tangy aroma. The soup will thicken slightly and take on a smooth mouthfeel as the proteins and fats integrate. Stir often and keep the heat moderate to prevent the cheddar from clumping or becoming greasy. If the cheese resists melting, try smaller amounts added gradually and constant stirring to coax a silky finish.
- Ladle the soup into bowls and top with fresh thyme: Serving reveals the final sensory payoff, with steam carrying herbaceous notes and the surface glossy from the melted cheese. A sprinkle of fresh thyme brightens each spoonful and adds visual contrast. Enjoying immediately ensures the best temperature and texture; letting it sit too long can cool it down and slightly change the mouthfeel.
Notes
- Thickening trick Add 2 to 3 tablespoons of all purpose flour during the very last minute of cooking the onion in step one to help bind the soup if your cheddar is having trouble integrating.
- Milk swap Use a higher fat dairy if you want a richer mouthfeel, just warm it before adding to prevent the soup from seizing.
- Cheese control Add the cheddar cheese in small handfuls while stirring to encourage a smooth melt and prevent clumping.
- Spice adjustment Increase the cayenne gradually to build heat, tasting as you go so the pepperiness complements rather than overwhelms the vegetables.
- Broth choice Choose low sodium broth to maintain control over seasoning, and adjust salt at the end to taste.
- Herb finish Reserve fresh thyme for garnish to add a fragrant lift right before serving, which brightens each spoonful.