Begin by marinating the chicken breasts. In a bowl, mix olive oil, chili powder, cumin, garlic powder, smoked paprika, salt, and pepper.
Coat the chicken breasts with the spice mixture, ensuring they are well covered. Let them marinate for at least 30 minutes in the refrigerator for the flavors to meld.
Preheat a grill pan or skillet over medium heat. Cook the chicken for about 6-7 minutes on each side or until fully cooked (internal temperature reaches 165°F/75°C). Once cooked, remove from heat and let rest for 5 minutes before slicing.
While the chicken is resting, assemble the bowls. Start with a base of cooked quinoa or brown rice in each bowl.
Layer the black beans, corn, diced red bell pepper, and cherry tomatoes over the quinoa or rice.
Slice the rested chicken breasts and arrange the slices on top of the veggies in each bowl.
Top with sliced avocado and garnish with chopped cilantro.
Serve with lime wedges on the side for an extra burst of freshness.