DIRECTIONS

In a bowl, combine the first four ingredients. Crumble beef over mixture and mix well. Shape into four patties.
    Grill, covered, over medium heat for 6 minutes on each side or until meat is no longer pink. During the last minute of cooking, top each patty with two triangles of American cheese and one triangle of Swiss cheese. Serve on buns with lettuce, tomato, onion, bacon, ketchup and mustard if desired. Yield: 4 servings.