In a skillet, cook sausage and green pepper over medium heat until meat is no longer pink, drain. Stir in pasta and spaghetti sauce, mix well. Transfer to a greased 13x9x2 inch baking dish. Cover and bake at 350 for 25 minutes. Uncover, sprinkle with cheese. Bake 5 to 10 minutes longer or until the cheese is melted.