In a medium bowl, combine the chicken cubes with cumin, smoked paprika, garlic powder, salt, and black pepper. Toss until evenly coated.
Heat olive oil in a large non-stick skillet over medium-high heat. Add the chicken and sauté until the internal temperature reaches 165°F (74°C), approximately 8 to 10 minutes. Remove chicken from the skillet and set aside.
Add the cauliflower rice to the same skillet. Sauté for 3 to 5 minutes over medium heat until tender but firm.
Divide the sautéed cauliflower rice evenly among four serving bowls.
Layer each bowl with equal portions of the cooked chicken, black beans, corn, cherry tomatoes, diced bell pepper, and red onion.
Garnish each bowl with chopped cilantro and a tablespoon of Greek yogurt as a low-calorie sour cream substitute.
Serve immediately with a lime wedge for fresh acidity.