Slice the chicken breast into thin strips and place them in a bowl.
Season the chicken with cumin, chili powder, garlic powder, sea salt, and black pepper, tossing to coat evenly.
Heat the olive oil in a large skillet over medium-high heat.
Add the chicken strips to the skillet and cook for 5-6 minutes until golden brown and cooked through, then remove and set aside.
In the same skillet, add the sliced bell peppers and red onion, sautéing for 4-5 minutes until they are tender and slightly charred.
Warm the pre-cooked brown rice and place it at the base of a serving bowl.
Top the rice with the sautéed chicken, peppers, and onions.
Garnish with fresh cilantro, sliced avocado, and a generous squeeze of lime juice before serving.