1 (12 oz.) can Tuna (11 sandwiches) or (9 oz.) can Tuna (7-8 sandwiches)
1/3 cup mayonnaise
1/4 cup chopped onion
1/4 cup celery (chopped)
1/2 cup American cheese (grated or sliced)
Butter bottom of buns. Fill with Tuna and top with cheese. Individually wrap sandwiches in foil and bake at 350 F for 25 minutes.