01 - Combine chicken pieces with olive oil, chili powder, cumin, smoked paprika, garlic powder, salt, and black pepper in a bowl. Toss until evenly coated with the spice mixture.
02 - Heat a large skillet over medium-high heat. Add the seasoned chicken and cook for 6-8 minutes, stirring occasionally, until fully cooked through and lightly browned. Transfer to a plate and cover to keep warm.
03 - In the same skillet, add 1 tablespoon olive oil and the riced cauliflower. Cook for 4-5 minutes, stirring frequently, until tender but not mushy. Season lightly with salt and pepper to taste.
04 - Dice the bell pepper and red onion into uniform pieces. Halve the cherry tomatoes. Slice the avocado into thin wedges. Chop the fresh cilantro for garnish.
05 - Create each bowl by starting with a base of riced cauliflower. Arrange cooked chicken, bell pepper, red onion, cherry tomatoes, and avocado on top. Add shredded cheese and salsa. Finish with sour cream and jalapeño slices if desired. Sprinkle with fresh cilantro and serve with lime wedges on the side.
06 - Serve the bowls while the chicken and cauliflower rice are still warm. Squeeze fresh lime juice over the top just before eating for optimal flavor.