Cheese Puffs
["1 loaf firm, unsliced white bread", "1 (3 oz.) pkg. cream cheese", "1/4 lb. Cheddar cheese", "1 c. margarine", "2 egg whites, beaten stiff"]
["Trim crusts off bread, cut into 2-inch cubes.", "Melt cheese and margarine in double boiler.", "Remove from heat and fold in egg whites.", "Dip cubes into mixture until well coated.", "Place on cookie sheet and refrigerate overnight.", "Bake at 400\u00b0 for 12 to 15 minutes, until golden brown.", "Makes 3 dozen."]
["bread", "cream cheese", "Cheddar cheese", "margarine", "egg whites"]