Cook macaroni as package label directs; drain. Meanwhile, prepare Sloppy Joe seasoning mix with ground beef, tomato paste, tomato sauce and 1 1/2 cups water. Preheat oven to 350 degrees. In 2 1/2-quart casserole, layer 1/2 the macaroni, 1/2 the cottage cheese and 1/2 of the meat sauce; repeat. Top with cheddar cheese. Bake, uncovered, 40 to 50 minutes, or until bubbling.