preheat oven to 350. spray 9"x"13 casserole dish-i use a lasagna tin- with cooking spray

spoon about a half cup sauce on bottom of casserole . not alot, just enough to lightly cover. lay frozen chicken on top. its ok to put pieces on top of each other, just try to do it evenly

sprinkle parmesan cheese on top of chicken, then top with rest of sauce, making sure to cover all chicken well. you can use a little more if you like it saucy, just not too much or it will end up soggy

top with mozzarella cheese. two cups is just a suggestion, if you like it super cheesy, go for it! :-D

pop it in the over for 30-35 minutes, until cheese is nice and bubbly and chicken is cooked through. if the cheese is cooking faster than the chicken, i move it to bottom rack and that usually does the trick! serve with pasta and garlic bread if desired, and enjoy!