Preheat oven to 350°. Cook spaghetti according to package directions. , Meanwhile, in a large bowl, beat egg, milk and salt. Drain spaghetti; add to egg mixture and toss to coat. Transfer to a greased 13x9-in. baking dish., In a large skillet, cook 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, 20 minutes. Sprinkle with the cheese. Bake 10 minutes longer or until cheese is melted. Let stand 10 minutes before cutting.