Macaroni and Cheese Lasagna

1 pkg. macaroni and cheese, prepared according to package directions
1 1/2 cups spaghetti sauce
1/2 lb. lean ground beef, cooked & drained
1 cup shredded mozzarella cheese
2 tbl. Parmesan cheese

Spoon half of macaroni into lightly greased 8" square baking dish. Top with half each meat, sauce and mozzarella cheese. Repeat layers. Sprinkle with Parmesan cheese. Bake at 350ºF for 20 minutes, or until heated through.