Ohhh Gooey Chicken

1 2.25-lb. bag chicken breast filets, thawed

1 23-oz. jar marinara sauce

4 8-oz. bags grated mozzarella cheese

Preheat oven to 400 degrees F. On a cookie sheet, place chicken breasts evenly with none overlapping. Bake until done; about 25 minutes. Remove from oven and pour entire jar of marinara evenly over baked chicken. Sprinkle mozzarella cheese over the top, covering sauce. Return pan to oven and bake until cheese melts.