Yes, you can! To freeze, let the Mac and Cheese recipe completely cool. Add the cooked and cooled Mac and cheese to a freezer-safe container, or bag. (I love my food saver for this.) Freeze for up to three months. To reheat from frozen, reheat the pasta in a microwave-safe dish for 3 to 4 minutes. You can add a bit of milk to the reheated pasta to make it creamier.