Heat oven to 350F. In a small bowl whisk together salad dressing, powdered peanut butter and soy sauce.
Microwave frozen riced cauliflower per package instructions. Move on to next steps while it cooks. When finished, open bag and pour into bottom of 8x8 inch baking dish.
Heat a large skillet to medium high heat sprayed with cooking spray. Add chicken and brown on each side. Remove and add over top of riced cauliflower.
Add onions and peppers to the skillet. Cook 3 minutes. Add over top of chicken. Pour salad dressing mixture over all ingredients and place in oven heated to 350F.
Bake for 20 minutes or until chicken is done (165F). Remove, allow to cool slightly and serve.