In a large skillet, heat olive oil over medium-high heat.
Add diced chicken breast to the skillet and cook until browned and cooked through, about 5-6 minutes. Remove the cooked chicken from the skillet and set aside.
In the same skillet, add bell pepper and onion slices. Sauté until they are slightly tender, about 4-5 minutes.
Return the cooked chicken to the skillet and add chili powder, cumin, paprika, garlic powder, salt, and pepper. Stir well to coat the chicken and vegetables with the spices.
Reduce the heat to low and let the mixture simmer for 2-3 minutes to allow the flavors to meld together.
Meanwhile, steam or sauté the cauliflower rice until tender.
Divide the cauliflower rice among serving bowls. Top with the chicken and vegetable mixture.
Garnish each bowl with cherry tomatoes, diced avocado, and fresh cilantro.
Serve with lime wedges on the side for squeezing over the bowl.