1 can cream of mushroom soup
Milk
4 oz. spaghetti broken into 2 inch pieces
1 (7 oz.) can tuna, flaked
1/3 c. chopped onion
1 (3 oz.) can mushrooms, undrained
8 oz. grated sharp cheese

Cook spaghetti, drain. Dilute soup with milk according to label. Add soup mixture, tuna, onions, mushrooms and all but 1/2 cup cheese to spaghetti. Mix lightly and pour into casserole. Bake at 350 degrees for 45 minutes; sprinkle with remaining cheese and bake until cheese melts.