In a shallow bowl, combine Parmesan cheese, oregano, parsley, garlic salt and pepper. Dip chicken breasts in melted butter, then coat with Parmesan mixture. Place in a greased 9-in. square baking dish. Drizzle with any remaining butter. Bake, uncovered, at 425° for 15-20 minutes or until the chicken juices run clear. Serve with brussels sprouts if desired.