Prep the chicken and veggies: Cut the chicken into small, even pieces so it cooks quickly.
Slice peppers and dice the onion. Keep spices measured and ready.
Heat the pan: Warm the olive oil in a large skillet over medium-high heat. When it shimmers, add the chicken in a single layer.
Season lightly with salt and pepper.
Sear the chicken: Cook for 4–6 minutes, stirring occasionally, until the edges are browned and the chicken is mostly cooked through. Transfer to a plate and keep warm.
Sauté the aromatics: In the same skillet, add the onion and peppers with a pinch of salt. Cook 4–5 minutes until softened and lightly charred at the edges.
Add the garlic and cook 30 seconds until fragrant.
Add spices: Sprinkle in chili powder, cumin, smoked paprika, oregano, and cayenne (if using). Stir for 20–30 seconds to bloom the spices.
Build the skillet: Return the chicken to the pan. Add black beans, corn, diced tomatoes with chiles (and their juices), and chicken broth.
Stir to combine.
Simmer to thicken: Reduce heat to medium. Let it bubble for 5–7 minutes, stirring occasionally, until slightly thickened and the chicken is fully cooked. If it looks dry, add a splash of broth.
Finish with cheese and lime: Sprinkle cheese over the top.
Cover the skillet for 1–2 minutes until melted. Squeeze in the lime juice and stir gently. Taste and adjust salt and heat.
Serve: Spoon into bowls over rice or quinoa, tuck into tortillas, or pile on shredded lettuce for a lighter bowl.
Add avocado, cilantro, salsa, and a dollop of Greek yogurt if you like.