Preheat oven to 375° degrees F. Spray a 9×13 glass baking dish with cooking spray.
Combine the Ranch seasoning mix, the crushed Corn flakes and Parmesan cheese into a large freezer baggie.
Shake well to mix all together.
Dip each chicken breast into the melted butter, and then drop into the baggie. Seal the bag shut and then shake well to coat with the seasoning mix. After well coated lay chicken into the baking dish. Repeat with all of the chicken.
Once all chicken has been coated, sprinkle the remaining seasoning mixture onto the tops of chicken.
Bake chicken for 40- 45 minutes. (Towards the last 15 minutes of cooking you may need to lay a piece of foil over the top to prevent from burning.)