Add the oil and onion to a Dutch oven or soup pot and sauté over medium-high heat until softened and lightly browned (about 5-7 minutes).: As the olive oil warms you should smell a faint fruity note, then a sweet onion aroma will emerge and deepen as the edges pick up color; listen for a gentle sizzling that indicates the moisture is evaporating. This step is crucial because those browned bits deposit complex flavors into the base, which the broth will later lift. Watch closely to avoid burning, a common mistake is leaving the heat too high which can turn the onion bitter. If it starts to brown too fast, lower the heat and stir more frequently. Aim for soft, glossy pieces with slightly caramelized edges before moving on.
Add the remaining soup ingredients to the pot except for the cream cheese, chicken, and salt & pepper.: When you pour in the chicken broth , tomato sauce , red enchilada sauce , black beans , corn , green chilies , chopped red bell pepper , and the spice mix, you will hear the liquid settle and start to steam; the aromas will escalate quickly as the acids and spices mingle. This layering lets the flavors marry gently rather than becoming a muddled one note. Stir to combine so the spices distribute evenly. A frequent error here is adding cream cheese too soon, which can clump, so hold off and let the broth integrate first. Keep the pot uncovered so steam can escape and flavors concentrate.
Increase the heat to high and bring the soup to a boil. Reduce the heat so it's simmering gently (uncovered) for 5 minutes.: You will see vigorous bubbling as the pot reaches a boil, and steam will rise in a steady plume. Reducing to a gentle simmer calms the surface into soft, rolling bubbles, which is the perfect environment for the ingredients to trade flavor. This short simmer lets the canned sauces meld with the spices and softens the bell pepper without turning it to mush. Avoid a hard boil for too long because aggressive boiling can break down textures and cause evaporation that over intensifies salt. Keep an eye on it and stir once or twice so nothing sticks.
Cut the cream cheese into smaller pieces and microwave it in 20-30 second intervals until very soft, then add it to the soup. Let it melt in (you may have to stir it a fair bit until it's fully dissolved).: The softened cream cheese should be pliable and warm to the touch before you add it, otherwise it can form lumps. Microwaving briefly in intervals helps you achieve a smooth, pourable consistency; you will see it loosen and shine as moisture redistributes. Stirring it into the hot soup will produce a satin, slightly thickened broth with a mellow tang. If lumps form, use vigorous stirring or a whisk to coax them out; the most common misstep is adding cold cream cheese straight from the fridge which resists incorporation. Take your time and stir until the texture is uniformly smooth.
Stir in the chicken and cook for another 5-7 minutes or so.: When you fold in the shredded chicken , the pot will take on a fuller body and the steam will smell richer and meaty. This step warms the cooked meat through and allows it to absorb some of the broth flavors. You should see the chicken threads relax and mingle with the beans and corn, making the soup visually hearty. Overcooking is a risk here if the chicken is already tender, so warm just until heated through to prevent dryness. Gently stir to distribute the chicken evenly and taste a spoonful to confirm the texture is right.
Season the soup with salt & pepper and serve with toppings as desired.: At this finish stage your nose will guide you; the flavors should taste rounded but lively. Add salt and pepper incrementally, tasting between additions because the canned ingredients can vary in sodium. This is the moment to brighten with a squeeze of lime or add richness with shredded Mexican cheese blend on top. A typical error is over salting early, so season lightly and adjust. Serve bowls while hot, and let guests customize with toppings so each bowl reflects personal preference.