Coat a large, nonstick pan with cooking spray. Add olive oil and heat over medium-high heat. Stir in cauliflower rice, onions, red bell pepper, and garlic. Stir-fry for 3 minutes. Stir most of the time. Mix in black beans, tomatoes, corn, cumin, chili powder, a little black pepper, and ½ cup water or vegetable broth. Mix together until well blended. Bring to a boil. Lower heat and simmer for several more minutes. If too dry add a few more tablespoons of water. Add cilantro and mix well.