Season the chicken breast evenly with chili powder, cumin, sea salt, and black pepper.
Heat the olive oil in a large skillet over medium-high heat.
Add the chicken to the skillet and cook for 6 to 7 minutes per side, or until the internal temperature reaches 165°F.
Remove the chicken from the pan and let it rest for 5 minutes before slicing into strips.
In the same skillet, sauté the sliced bell peppers and red onion for 3 to 4 minutes until they are tender but still have a slight crunch.
Prepare the salsa fresca by combining the diced tomato, chopped cilantro, and lime juice in a small bowl.
Assemble the bowl by placing the cooked brown rice and rinsed black beans at the bottom.
Layer the sautéed peppers, onions, and sliced chicken on top of the rice and beans.
Finish the bowl with the fresh salsa fresca and sliced avocado.