Slice the chicken breast into thin strips and place them in a bowl.
Toss the chicken with chili powder, cumin, garlic powder, sea salt, and black pepper until evenly coated.
Heat the olive oil in a large cast-iron or stainless steel skillet over medium-high heat.
Add the seasoned chicken to the skillet and cook for 5-6 minutes, stirring occasionally, until golden brown and cooked through.
Remove the chicken from the skillet and set aside on a plate.
In the same skillet, add the sliced bell peppers and red onion, sautéing for 4-5 minutes until they are tender-crisp and show slight char marks.
Return the chicken to the skillet and drizzle with fresh lime juice, stirring to combine and deglaze the pan.
Place the warm cooked brown rice in a serving bowl and top with the chicken and vegetable mixture.
Finish the bowl by adding the sliced avocado and a sprinkle of fresh chopped cilantro.