Marinate the chicken: In a bowl, mix olive oil, chili powder, garlic powder, cumin, smoked paprika, salt, pepper, and lime juice. Coat the chicken and let it marinate for 10 minutes.
Grill the chicken: Heat a pan or grill over medium heat and cook the chicken for 6–7 minutes per side until fully cooked. Let it rest for 5 minutes before slicing.
Prepare the street corn: In a skillet, char the corn kernels until slightly browned. In a bowl, mix mayonnaise, sour cream, chili powder, cayenne, cotija cheese, cilantro, and lime juice. Stir in the charred corn.
Assemble the bowl: In serving bowls, add a base of rice. Top with sliced grilled chicken, street corn mixture, black beans, diced tomatoes, and avocado.
Garnish and serve: Sprinkle extra cilantro and serve with lime wedges. Enjoy!