Spread 1 cup of pasta sauce in ungreased 9 x 13 inch pan.
Arrange ½ of the frozen ravioli over pasta sauce, covering the bottom of the pan.
Top with ½ of the remaining pasta sauce, 1 cup of cottage cheese, and 1 cup of mozzarella cheese. Repeat layers again starting with ravioli.
Top with parmesan cheese. Bake for 30-40 minutes or until cheese begins to bubble.
To make into a freezer meal, assemble casserole as directed above in freezable container. Secure with lid and freeze for up to 30 days. Thaw for one hour before baking. Bake at 350 degrees for 40-50 minutes, or until cheese begins to bubble.