Heat A Skillet Over Medium Heat. Butter One Side Of Each Slice Of Bread. Sprinkle Parmesan Cheese Onto The Buttered Sides. Place One Slice Buttered Side Down In The Skillet, And Place A Slice Of American Cheese And A Slice Of Cheddar Cheese On It. Top With The Remaining Slice Of Bread, Butter Side Up. Fry Until Golden On Each Side.