Hamburger Stroganoff

1 lb. hamburger

1/2 cup chopped onion

1/4 cup margarine

2 Tbsp. flour

1 tsp. salt

1/4 tsp. pepper

4 oz. can mushrooms, drained (or 1 pkg. fresh mushrooms, sliced)

1 can cream of mushroom soup

1/2 soup can milk

1 1/2 cup sour cream

Cook and stir hamburger and onion in margarine until hamburger is light brown. Stir in flour, salt, pepper, and mushrooms. Cook for 5 minutes, stirring constantly. Reduce heat, add soup and 1/2 soup can of milk. Simmer uncovered for 10 minutes. Stir in sour cream; heat through. Serve over hot noodles or rice.