Cut the corn tortillas in half and cover the bottom of the baking dish.
Top with cauliflower rice and brown rice.
Create another layer with corn tortillas.
Add the peppers, tomatoes, onions, and chicken.
Create a top layer with corn tortillas.
Cover with taco sauce and cheese.
Bake at 425 for 30-40 minutes until fully heated through. Cook covered with tin foil. Remove tin foil for the final 10 minutes.