In a Dutch oven, cook the beef and onion over medium heat until meat is no longer pink; drain. Stir in the tomatoes, salt, basil and pepper. Reduce heat to low; cover and cook for 45 minutes, stirring occasionally.
Cook ziti according to package directions; drain. Place in a large bowl. Stir in sauce and 1 cup mozzarella cheese. Transfer to a greased 3-qt. baking dish; sprinkle with Parmesan cheese and remaining mozzarella cheese.
Cover and bake at 350° for 15 minutes. Uncover; bake 15 minutes longer or until heated through.