Cook noodles according to package directions. Meanwhile, in a large skillet, cook beef and onion over medium heat until meat is no longer pink, breaking it into crumbles; drain. Add the tomato sauce, garlic powder, salt and pepper. , In a large bowl, combine the cream cheese, cottage cheese, Parmesan cheese, onions and green pepper. Drain noodles; place half in a greased 13x9-in. baking dish. Top with half each of the meat and cheese mixtures. Repeat layers. Sprinkle with additional Parmesan cheese if desired. , Cover and bake at 350° for 30-35 minutes or until heated through.