Cut the chicken breast into bite-sized pieces and season evenly with garlic powder, smoked paprika, sea salt, and black pepper.
Heat the olive oil in a large skillet over medium-high heat. Add the chicken and sauté for 5-7 minutes until cooked through and golden brown.
Add the diced red bell pepper to the skillet with the chicken and cook for an additional 3 minutes until the peppers are slightly softened.
In a separate small pan or microwave-safe bowl, lightly steam the cauliflower rice for 3-4 minutes until tender.
Rinse and drain the black beans, then warm them slightly if desired.
Assemble the bowl by placing the baby spinach at the bottom, followed by the cauliflower rice, black beans, and the chicken and pepper mixture.
Top the bowl with sliced avocado and a fresh squeeze of lime juice before serving.