Heat the oil in a large stockpot over medium-high heat. When the oil shimmers, add the onion and sweet potatoes. Season with salt and pepper and cook for 5-8 minutes or until softened and the onion fragrant. Slowly pour in the chicken broth, enchilada sauce, green chiles, and 1 cup water. Bring the mix to a boil over high heat. Add the quinoa, cover and reduce the heat to low. Cook for 15 minutes or until the quinoa is soft. Stir in the turkey, black beans, and 1 cup cheddar cheese. Cook until the cheese is melted and the turkey warm, about 5 minutes. Remove from the heat.: The moment the olive oil begins to shimmer you will notice a faint fruity scent, which signals the right temperature for sautéing. As the oil heats, it should glide across the bottom of the pot and form a thin, glossy layer, never a thin smoke, which means it is too hot. Heat helps the onion and sweet potato release aromatics quickly, making the base of the soup much more flavorful; if the oil smokes, remove the pot from heat briefly and lower the burner, because burned oil will add bitterness. A common mistake is trying to rush by using higher heat, which can brown the vegetables unevenly instead of softening them. Keep the pan level so the oil covers the surface and ensures even cooking.
Ladle the soup into bowls, garnish with avocado, cheddar cheese, cilantro and chips. Eat!: As you add the chopped sweet onion and cubed sweet potato , they should sizzle softly on contact, releasing a faint caramel scent within a minute or two. Stir to coat them with the hot oil so they cook evenly; this initial sizzle helps the edges begin to color and the surfaces to soften, which builds flavor. Look for the onion to turn translucent and the sweet potato to begin to yield to a fork tip, that is your cue to move on. Avoid overcrowding the pot, which causes steaming instead of sautéing and yields less flavorful results.
Season with salt and pepper and cook for 5-8 minutes or until softened and the onion fragrant: You will smell the onion become aromatic and notice the sweet potato edges losing their raw starch scent as they soften; this step builds the flavor foundation. Stir occasionally so the vegetables brown lightly but do not burn; gentle browning adds complexity. If they are not soft after eight minutes, reduce the heat and cover briefly, as rushing with higher heat risks blackened bits that taste bitter. Remember salt early to help draw moisture out of the vegetables and enhance their flavor.
Slowly pour in the chicken broth, enchilada sauce, green chiles, and 1 cup water: Pouring liquids slowly avoids shocking the hot oil and prevents splatter. As the broth and enchilada sauce hit the pot, you will see steam rise and the aroma shift to a richer, more layered scent. Stir to combine, scraping any browned bits from the bottom, because those bits hold concentrated flavor. Adding liquids also cools the pot slightly and helps control the simmer; if the mixture sputters aggressively, reduce heat. A common misstep is adding everything too fast and neglecting to deglaze the pot, which wastes flavor.
Bring the mix to a boil over high heat: Watch for even rolling bubbles across the surface, which indicate a true boil. The color will deepen as the enchilada sauce melds with the broth, and the steam will carry a warm, spicy aroma. Once boiling, reduce heat as directed in the next step to avoid an over aggressive boil that could break down the quinoa texture. Boiling briefly concentrates flavors and helps the sweet potato begin to soften further.
Add the quinoa, cover and reduce the heat to low: When you stir in the rinsed or dry quinoa , it will look pale and slightly translucent as it hydrates. Covering traps steam, which allows the grains to cook evenly into fluffy, slightly chewy kernels. Reducing heat to low keeps a gentle simmer, preventing the pot from boiling violently, which can make the quinoa foam and escape the pot. A tip is to give the pot a gentle stir once or twice during cooking so nothing sticks and so you can monitor texture.
Cook for 15 minutes or until the quinoa is soft: During these minutes you will notice the quinoa plump and the broth thicken slightly as starch is released, lending a comforting body to the soup. The aroma should become deeper and well rounded, and the sweet potato should be easily pierced with a fork. Avoid overcooking, which makes the quinoa mushy; test early at 12 minutes if you prefer a firmer bite. If the mixture becomes too thick, add small amounts of additional chicken broth to reach the consistency you like.
Stir in the turkey, black beans, and 1 cup cheddar cheese: As you fold in the shredded turkey and rinsed black beans , the pot will smell more savory and rounded. The cheddar cheese added at this stage melts into a silky ribbon that enriches the broth and brings a pleasant tang. Stir until the cheese is fully melted and the turkey is warmed through; aggressive boiling after adding cheese can separate the fats, so keep the heat low. A mistake to watch for is adding cold cheese straight from the fridge in large chunks, which can cause clumping; instead, add in smaller handfuls and stir to encourage even melting.
Cook until the cheese is melted and the turkey warm, about 5 minutes: In these final minutes the soup will come together, with the cheddar cheese fully integrating and the turkey losing any chill. You will notice a glossy surface and a cohesive texture, and the aroma will be rich and inviting. Keep the heat gentle to prevent separation and stir occasionally for uniform warmth. If you find the soup cooling too quickly, a brief low simmer will bring everything back to temperature without compromising texture.
Remove from the heat: Taking the pot off the burner allows residual heat to rest the soup and for flavors to meld further. The surface will calm from active simmering and the aroma will concentrate. Letting it sit for a minute or two also makes ladling easier and reduces the chance of splatter. Avoid leaving it uncovered too long, which can cool it excessively before serving.
Ladle the soup into bowls, garnish with avocado, cheddar cheese, cilantro and chips: When you ladle, notice the steam and the first fragrant notes that reach you, then add diced avocado , extra shredded cheddar cheese , fresh cilantro , and crunchy chips for textural contrast. The cool avocado brightens the savory broth, and the chips add a satisfying crunch. Serve immediately for the best contrast between hot soup and cool garnish; a common oversight is prepping garnishes too far ahead, which can wilt herbs or allow avocado to brown.
Eat!: The final reward is the mix of warm, rich broth, tender turkey , and the little pops of texture from beans and quinoa . Take a spoonful that includes a bit of everything to experience the full balance of this dish. If the soup tastes slightly flat, finish with a squeeze of fresh lime or a pinch of salt to lift the flavors.