Rub the chicken breast evenly with the ground cumin, garlic powder, chili powder, and sea salt.
Heat olive oil in a large skillet over medium-high heat and sear the chicken for 5-7 minutes per side until the internal temperature reaches 165 degrees.
Remove the chicken to a cutting board to rest, then in the same skillet, sauté the sliced bell peppers and onions until they are tender and slightly charred.
Lightly steam the cauliflower rice and warm the pre-cooked brown rice and black beans in a separate pan or microwave.
In a large serving bowl, create a base by mixing the cauliflower rice and brown rice together to add volume and texture.
Slice the rested chicken into bite-sized strips and arrange them over the rice along with the warm black beans, sautéed peppers, and onions.
Top the bowl with fresh avocado slices, salsa, a squeeze of lime juice, and chopped cilantro before serving.