Heat the pan: Set a large skillet over medium heat and add the oil. Let it warm until it shimmers.
Brown the chicken: Add the ground chicken.
Break it up with a spatula and cook until lightly browned and mostly cooked through, about 5–6 minutes.
Sauté the veggies: Add onion, bell pepper, and zucchini. Cook, stirring occasionally, until softened, 4–5 minutes. Stir in the minced garlic and cook 30 seconds more until fragrant.
Add spices: Sprinkle in chili powder, cumin, smoked paprika, oregano, garlic powder, onion powder, salt, pepper, and red pepper flakes if using.
Stir well so the spices coat the meat and vegetables.
Simmer with sauce: Pour in the tomato sauce and chicken broth. Stir and let it simmer 3–4 minutes to thicken slightly. Taste and adjust salt or spices.
Add cheese: Reduce heat to low.
Sprinkle cheese evenly over the skillet. Cover for 1–2 minutes until melted and gooey.
Finish and brighten: Turn off the heat. Squeeze in lime juice and sprinkle cilantro on top.
This freshens the flavors and balances the richness.
Serve: Spoon into bowls or over shredded lettuce. Add avocado, sour cream, jalapeños, and extra lime if you like. Hot sauce is great here, too.