Place butter in 11x7x1 1/2 baking dish. Heat butter in 325 oven five minutes or until melted. tilt pan to coat. pour in croutons, sprinkle with cheese and set aside. Combine milk, eggs, dry mustard. mix well nd pour over cheese . Sprinkle with bacon. Bake 325 40-50 minutes or until set. let stand 5 minutes before serving