Magic Puff Tuna Sandwich
["6 1/2 oz. can tuna", "2 c. shredded Cheddar cheese", "1/4 c. diced celery", "1/4 c. chopped onion", "3 Tbsp. lemon juice", "1 1/4 c. Bisquick", "3/4 c. mayonnaise", "1 egg", "6 slices bread"]
["Mix Bisquick, mayonnaise and egg.", "Stir in remaining ingredients except bread.", "Spread ingredients evenly over 6 slices bread.", "Bake at 450\u00b0 for 10 minutes or until puffy and golden brown."]
["tuna", "Cheddar cheese", "celery", "onion", "lemon juice", "Bisquick", "mayonnaise", "egg", "bread"]