2 c. dried macaroni
2 (6 oz. each) cans tuna, drained
1 (4 oz.) can mushrooms, drained
1 sm. onion
1 pt. carton sour cream
1 c. milk
Salt and pepper

TOPPING:

1/2 c. dry bread crumbs
1/4 c. butter, melted
1/4 c. Parmesan cheese

Cook noodles as directed; drain. Mix noodles, tuna, mushrooms, onion, sour cream, milk, salt, and pepper (to taste) in 3 quart casserole. Mix topping and sprinkle on top of casserole. Bake covered at 350 degrees for 45 minutes.