Boil the chicken breast. After, Shred chicken into pieces and place in pan with a small can of tomato sauce.
Prepare the casserole dish and spray with a non stick spray. Place one layer of corn tortillas and fill the bottom of the dish.
Layer the chicken on top of the tortillas, and the cheese on top of the chicken. Repeat the same process 1 more time starting with another layer of tortillas
Cover and Bake for 45 Minutes. Top with diced tomatoes and Enjoy!