Are you ready to kick up your classic mashed potato dish a few notches? If so, you are going to love this cheesy mashed potato casserole which has a layer of warm toasted cheese on top—yum! Plus, I’ve added a make ahead note so this recipe can easily make an appearance on your holiday table this year. And since it calls for unpeeled potatoes, you can count on that extra nutritional punch that you wouldn’t get otherwise. Enjoy!