Dice the chicken breast into bite-sized pieces and season thoroughly with chipotle powder, sea salt, and black pepper.
Heat avocado oil in a large cast-iron skillet over medium-high heat until shimmering.
Add chicken to the skillet and sear for 6-8 minutes, stirring occasionally, until the edges are golden and crispy.
Remove chicken and add sliced bell peppers and red onions to the same pan, sautéing until tender-crisp.
In a separate pan or microwave, steam the cauliflower rice until tender, then fold in the black beans.
Assemble the bowl by layering the cauliflower rice and bean mixture, followed by the sautéed vegetables and crispy chicken.
Garnish with fresh avocado slices, chopped cilantro, and a generous squeeze of lime juice.