Most casseroles and stuffing also freeze well. Cut them into portions before freezing so that you only have to thaw one portion at a time.
We haven't had a lot of success freezing mashed vegetables. Once thawed, we find they tend to be watery and have lost much of their flavor. Unfortunately, we recommend tossing these leftovers.
Cooked pies and other desserts also don't usually do well in the freezer. If you somehow haven't managed to eat all your pie by today, you have a good excuse for serving it for dinner tonight!
Remember, these leftovers have already been sitting in your fridge for a week, so you don't want thawed food sitting in your fridge for another week. Thaw only what you'll eat right then. Also, be sure that all previously prepared foods are reheated to at least 165° before serving.
Related: The Case Against Turkey Leftovers