Preheat oven to 350 degrees F. Spray an 8x10 baking dish with nonstick cooking spray.
Bring a pot of water to a boil. Cook the rigatoni according to the directions on the box.
In a large skillet brown the ground beef and onion. Drain any excess grease.
Add the tomato sauce, seasonings and Parmesan cheese to a saucepan. Bring the sauce to a simmer then add it to the ground beef.
Mix together the cooked noodles and cottage cheese. Add the noodles to the baking dish.
Pour the sauce over the noodles then top with the shredded mozzarella cheese.
Bake 25 minutes or until the cheese is completely melted.