Combine beef, bread crumbs, parsley, salt and pepper; shape into 1-inch balls.
Fry in oil in large skillet until well browned on all sides.
Push to sides of skillet.
Blend sauce mix, water and sherry, if desired; stir into skillet.
Cover and simmer 10 minutes.
Stir in sour cream; heat to serving temperature, but Do Not Boil.
Meanwhile, cook noodles according to package directions; drain.
Serve stroganoff and meatballs over noodles.