Beef Stroganoff

Ok I know this recipe has the dreaded white stuff in it but Brad really likes it (he doesn't know what's in it) I think he was suspicious of what made it so creamy but he really likes it and just said not to tell him what was in it :D

1 lb. hamburger
1 chopped onion
1/4 c. butter (optional)
2 Tbsp. flour
1 tsp salt or garlic salt
1/4 tsp. pepper
1 can cream of chicken soup
1 c. sour cream
Hot cooked noodles

Mix hamburger, onion, and butter and cook through. (Use butter with game meat, you don't need it with regular hamburger). Add flour, salt, and pepper and cook for a few minutes. Stir in cream of chicken soup and simmer 10 minutes (I add a little milk so it's not so thick). Stir in sour cream. Serve over hot noodles.