Cook spaghetti according to package directions; drain. In a large bowl, beat egg and milk. Add spaghetti; toss to coat. Transfer to a 13x9-in. baking dish coated with cooking spray., In a large skillet, cook the beef, sausage, onion and green pepper over medium heat until meat is no longer pink; drain. Stir in spaghetti sauce and tomato sauce. Spoon over the spaghetti mixture. , Bake, uncovered, at 350° for 20 minutes. Sprinkle with the cheese. Bake 10 minutes longer or until cheese is melted. Let stand for 10 minutes before cutting.