Tuna Fish Casserole
["1 can tuna", "1 can cream of mushroom soup", "2 tsp. minced onion", "1 (8 oz.) pkg. egg noodles", "1 can water"]
["Cook noodles until tender; drain. Add other ingredients.", "Bake 30 to 45 minutes at 375\u00b0 or until bubbly. Grated cheese may be added on top for the last 10 minutes."]
["tuna", "cream of mushroom soup", "onion", "egg noodles", "water"]