Preheat oven to 350°. Cook spaghetti according to package directions. Meanwhile, in a large skillet, cook beef, green pepper and onion over medium heat until meat is no longer pink; drain. Stir in next 8 ingredients. Drain spaghetti; add to beef mixture. , Transfer to a greased 13x9-in. baking dish. Cover and bake 30 minutes. Uncover; sprinkle with cheese. Bake until cheese is melted, about 5 minutes longer.