Freshly-made potatoes are preferable, but it is possible to make your Garlic Redskin Mashed Potatoes ahead of time and reheat to serve. They may thicken up as they get cold so you will need to add some liquid when you reheat.  Add a few tablespoons of butter to the top before heating, and then mix the melted butter in once the potatoes are warm. You could also mix in some warm milk to reach the right consistency. If you are preparing a large meal and want to save your potatoes for just a few hours before serving, put them in a slow cooker on a warm setting. The crock pot will keep them nice and warm and they will be ready to go when it’s time to eat.