This recipe is from Shirley McNevich's Mom's Best Recipes Vol 5. Published here with her permission.
Don't forget to check Shirley's blog.
(by Shirley McNevich)
6 boneless/skinless chicken breasts
1 - 15oz. jar of your favorite pizza/pasta sauce
1 cup shredded mozzarella cheese
salt, pepper and oregano to your taste
Sprinkle salt, pepper and oregano on each chicken breast--pound each with
a meat tenderizer. Flip chicken breasts over and repeat. Place chicken
breasts in a greased glass baking dish. Cover the dish with foil and bake at
350 degrees for 30 minutes. Remove from oven, turn all chicken breasts over
on the other side, and pour pizza/pasta sauce over all of the chicken. Put foil
back on and bake for 30 minutes more--test for tenderness. When chicken is
done, remove foil and sprinkle mozzarella cheese on top of the chicken
breasts. Return to oven (without foil) and bake until cheese is melted.