Preheat oven to 325°F. Lay chicken breasts in a 2" deep baking pan.
Mix your mayo or Miracle Whip in a bowl. Add your parmesan cheese till it’s a thick consistency. Add garlic powder to the above (use garlic to your own taste). Cover your chicken breasts with the mixture.
Put in oven with foil on top of baking pan for 1 hour. Remove foil and bake another 15 to 20 minutes.