Spray 2 9x13 pans with cooking spray. Remove chicken from the bone, and tear into small pieces. Lay 2 tortillas in the bottom, and tear 1 in half, and fit into pan to cover bottom. Lay 1/4 of chicken in pan, pour 1 can of sauce over chicken, then 1 cup of cheese over that. Then another layer of tortillas, chicken, sauce, and cheese. Then prepare your second pan the same way. Bake on 350 degree for 30 minutes or until the cheese is melted and starting to brown. Most of my kids like the red sauce, but my husband, myself, and a couple of kids like the green sauce. Try both, then decide which one you like for the next time you make this delicious casserole. Enjoy!