1 1/2 lb. hamburger
1 sm. onion
1 lg. (1 lb. 10 1/4 oz.) can Franco-American spaghetti with cheese
1 (16 oz.) can corn or peas
1 can tomato soup
1 can mushrooms (optional)

Brown and drain off fat from hamburger. Combine all ingredients. Bake 1 hour at 350 degrees.