Cook your base: Prepare brown rice, quinoa, or cauliflower rice according to package directions. Fluff and set aside.
Mix the seasoning: In a small bowl, combine chili powder, cumin, smoked paprika, garlic powder, onion powder, cayenne (if using), lime zest, salt, and pepper.
Season the chicken: Pat chicken dry.
Toss with 1 tbsp olive oil and about two-thirds of the seasoning blend until evenly coated.
Heat the pan: Set a large skillet or cast-iron pan over medium-high heat. Add 1/2 tbsp olive oil.
Sear the chicken: Add chicken in a single layer. Cook 4–6 minutes, stirring once or twice, until cooked through and lightly charred at the edges.
Transfer to a plate.
Cook the veggies: Add remaining 1/2 tbsp olive oil to the pan. Add peppers and onion. Sprinkle with the remaining seasoning.
Sauté 4–6 minutes until crisp-tender with some char.
Combine: Return chicken to the pan. Squeeze in the juice of half a lime. Toss for 30–60 seconds to coat and heat through.
Adjust salt and pepper.
Warm sides: If using corn and black beans, warm them briefly in the pan or microwave with a pinch of salt and a splash of water.
Assemble bowls: Add a scoop of rice or your chosen base to each bowl. Top with chicken and veggies, black beans, and corn.
Finish with toppings: Add avocado, a dollop of Greek yogurt, salsa, cilantro, and lime wedges. Serve immediately.