Bake chicken filets as directed on back of package. While chicken is cooking butter insides of buns place on cookie sheet with buttered sides facing up. When Chicken is cooked take out of the oven and turn oven to broil. Place buns under broiler to lightly toast. When golden brown put buns out of oven and take one chicken filet and place on top of each bun. Spoon marinara sauce over chicken and cover each sandwich with a slice of cheese and then sprinkle with Parmesan cheese. Place back under broiler until cheese is melted and bubbly!! Enjoy!