In a bowl, combine the beef, salt and pepper; mix well. Shape into six patties. Place the flour, eggs and crumbs in three separate shallow bowls. Dredge beef patties in flour; dip into eggs, then coat with bread crumbs.
In a large skillet, cook patties in oil over medium heat until meat is no longer pink. Arrange in a single layer in a greased 13-in. x 9-in. baking dish. Top each patty with mozzarella cheese, mushrooms, spaghetti sauce and Parmesan cheese. Bake, uncovered, at 400° for 25 minutes or until hot and bubbly. Serve on rolls or over spaghetti.