Prepare the brown rice according to package instructions and set aside.
Slice the chicken breast into thin strips and place in a small bowl.
Toss the chicken with chili powder, ground cumin, garlic powder, sea salt, and black pepper until evenly coated.
Heat the olive oil in a large non-stick skillet over medium-high heat.
Add the seasoned chicken to the skillet and cook for 5-7 minutes, stirring occasionally, until golden brown and cooked through.
Remove the chicken from the pan 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 with a slight char.
Return the chicken to the skillet, drizzle with lime juice, and toss everything together for 1 minute to combine the flavors.
To assemble, place the cooked brown rice in a bowl and top with the chicken and pepper mixture.
Garnish with fresh avocado slices and chopped cilantro before serving.