Sloppy Onion Burgers
["1 to 1 1/2 lb. ground beef (lean)", "1 can French onion soup (Campbell's)", "1 Tbsp. flour", "cheese slices"]
["Brown", "ground beef.", "Add onion soup and simmer; thicken with flour.", "Place", "on buns and top with cheese.", "Place under broiler until cheese melts."]
["ground beef", "onion soup", "flour", "cheese slices"]