Mom's Hamburger Stroganoff

1 1/2 lb hamburger
1/2 C chopped onion
2 Tbsp flour
1 tsp salt
1/4 tsp pepper
1 clove garlic, minced
4 oz mushrooms, sliced
1 can Cream of Mushroom soup (or homemade substitute!)
4 C dry egg noodles
1/4 C butter
1 C sour cream

Heat water to boiling; pour in noodles.  Cook until tender (approx 10 minutes).

Brown hamburger and onion, draining off fat.  Stir in flour, salt, garlic, pepper and mushrooms; cook for 5 minutes, stirring constantly  Stir in soup; heat to boiling, stirring constantly.  Reduce heat; simmer uncovered for 10 minutes.
Drain noodles; mix with butter.
Stir sour cream into meat mixture; heat thoroughly.
Serve over hot noodles.