In a skillet, cook beef and onion until meat is no longer pink and onion is
tender; drain. Sprinkle with salt and 1/4 tsp. pepper; set aside. In a large
bowl, combine pasta, 3 cups mozzarella cheese, cottage cheese, eggs, Parmesan
cheese, parsley and remaining pepper; stir gently. Pour into a greased
13-by-9-by-2 pan or shallow 3-quart baking dish. Top with the beef mixture and
spaghetti sauce. (Dish will be full).
Cover and bake at 350 degrees for 45 minutes. Sprinkle with remaining mozzarella
and bake uncovered 15 minutes longer or until the cheese is melted and bubbly.
Let stand 10 minutes before serving. Yields 6 to 8 servings.