In a small bowl, combine the chili powder, cumin, smoked paprika, garlic powder, salt, and pepper.
Rub the spice mix evenly over both sides of the chicken breasts.
Heat 1 tablespoon of olive oil in a large skillet over medium heat.
Add the chicken and cook for 6-7 minutes per side, or until fully cooked through.
Transfer the chicken to a plate and let it rest for a few minutes before slicing.
In the same skillet, add the remaining tablespoon of olive oil.
Add the sliced bell peppers and onion, and sauté for 5-6 minutes until tender.
To assemble the bowls, divide the rice among serving bowls.
Top with sliced chicken, sautéed peppers and onions, avocado slices, and fresh cilantro.
Serve with lime wedges for extra flavor.