Slice the chicken breast into thin strips and place in a bowl.
Toss the chicken with chili powder, cumin, smoked paprika, sea salt, and black pepper until evenly coated.
Heat the olive oil in a large skillet over medium-high heat.
Add the chicken strips to the skillet and sauté until browned and cooked through, approximately 5 to 7 minutes.
Remove the chicken from the pan and set aside.
In the same skillet, add the sliced bell peppers and red onion, cooking until they are tender and show slight char marks.
Return the chicken to the skillet and drizzle with fresh lime juice, tossing to combine all flavors.
Place the cooked brown rice in a serving bowl and top with the chicken and vegetable mixture.
Finish the bowl by adding the sliced avocado and garnishing with fresh cilantro.