In several large stockpots, cook beef and onions over medium heat until meat is no longer pink; drain. In several large bowls, combine the soup, milk, Worcestershire sauce, garlic powder, salt, pepper and paprika; add to beef mixture. Bring to a boil. Reduce heat and keep warm. Just before serving, stir in sour cream; heat through but do not boil. Serve with noodles. Yield: 70 servings (1 cup each).