Spray a skillet with cooking spray and heat over medium heat. Add chicken
season with salt and pepper
and cook
stirring occasionally
until no longer pink
about 7 minutes. Transfer to a plate.
Add onion and bell pepper slices to the skillet. Increase the heat to medium-high and sauté until slightly browned
about 5 minutes. Mix in diced tomatoes and cooked chicken. Cook until liquid is mostly evaporated
2 to 3 minutes.
Meanwhile
microwave cauliflower rice following the package instructions for 5 minutes. Let stand for 1 minute.
Carefully open the package of cauliflower rice and divide between two bowls. Divide chicken and vegetable mixture evenly between the bowls. Top with Cheddar cheese