1 lb. ground beef
1/2 c. chopped onion
1 tsp. salt
1/4 tsp. pepper
1 (8 oz.) can mushrooms
1 can cream of mushroom soup
2 tbsp. catsup
2 tbsp. Worcestershire sauce
1 (8 oz.) pkg. noodles
1 c. sour cream

Cook ground beef and onions until brown. Stir in salt, pepper, mushrooms, soup, catsup and Worcestershire sauce. Cover and simmer. Stir occasionally. Cook noodles, drain. Stir sour cream into meat mixture. Stir in hot noodles.