Preheat oven to 350° Brown beef with onion. Stir in 1/4 cup sauce 1/2 cup cheese, mushrooms and egg. Spread on each noodle with 1/3 cup meat mixture, roll up and place seam side down in 2 quart baking dish. Pour over with remaining pizza sauce. Bake 40 minutes. Sprinkle with cheese and return to oven another 5 minutes. Serve hot.