Pat the chicken breast dry and season both sides with ground cumin, chili powder, sea salt, and black pepper.
Heat the extra virgin olive oil in a skillet over medium-high heat until shimmering.
Add the chicken to the skillet and cook for 5-7 minutes per side, or until the internal temperature reaches 165°F.
Remove the chicken from the skillet and let it rest for 5 minutes before slicing into bite-sized pieces.
In the same skillet, add the sliced bell peppers and diced red onion, sautéing for 3-4 minutes until they are tender-crisp and slightly charred.
In a small mixing bowl, combine the warm cooked brown rice with fresh lime juice and chopped cilantro, tossing until well incorporated.
Warm the black beans in a small saucepan or microwave until heated through.
Assemble the bowl by placing the cilantro-lime rice at the base, then topping with the sliced chicken, sautéed vegetables, black beans, and fresh avocado slices.