Meanwhile, in a large skillet, cook beef and onion until meat is no longer pink; drain. Remove from the heat; stir in the tomato sauce, sugar, salt, garlic salt and pepper. In a small bowl, combine the cottage cheese, cream cheese, green onion, green pepper and sour cream.
Drain noodles; place half of noodles in a greased 1-qt. baking dish. Spoon half of beef mixture over the top. Layer with cottage cheese mixture and remaining noodles. Top with remaining beef mixture; sprinkle with Parmesan cheese.
Cover and bake at 350° for 20-25 minutes or until heated through.