Preparation - In a large mixing bowl, beat egg. Stir in 1/3 cup condensed onion soup, bread crumbs, mustard, chopped onion, salt and pepper. Add ground beef and mix throughly. Shape into 6 patties. Spray a large skillet with non-stick cooking spray. Fry each patty in skillet over medium-high heat for about 3 minutes per side or until evenly browned. Place browned patties on a paper-towel lined plate and set aside. Remove and discard drippings from skillet. Add flour and water to the skillet. Stir together until smooth. Add the remaining condensed onion soup and worcestershire sauce ; bring to a low boil. Cook and stir for 2 minutes. Place browned patties in skillet. Cover; simmer patties in gravy for 15 minutes. Serve over hot cooked noodles.