If your looking for a holiday side dish that combines visual wow factor with do ahead ease that also happens to taste really great, this could be your forever secret weapon. 'Purple Potatoes' you say? They have been a staple of Alaskan home gardens as long as I've lived here, the first time you see one you can't believe your eyes and now they are 'cropping up' in grocery stores all over the place. All hail the proliferation of this lovely tuber! Now you don't have to use purple potatoes, red or yellow waxy potatoes work fine, too. They just won't look as pretty.
Place potato slices in a bowl and pour over 1 cup of heavy cream. add a healthy sprinkle of salt and a dash of pepper and mix to coat.
Let that sit a minute while you grate your parmesan cheese:
Grease a glass loaf pan and line it with parchment paper so that the paper comes up the sides of the pan. Place a thin layer of potatoes to cover the bottom of the baking dish then sprinkle with 1/3 of the cheese. Alternate this way until all potatoes and cheese are used up.
Pour the cream left in the bowl over the layered potatoes. cover with another piece of parchment paper and place another loaf pan on top to weigh it down.
Bake in a preheated 375 degree oven for 45 minutes to an hour, until potatoes are tender when poked carefully with a knife
Place on a sheet pan in oven to catch any drips.
Pull from oven and cool completely with the weight still in place. At this point it can be wrapped and stored in the refrigerator for up to 5 days. When ready to serve, run a knife around the edge to loosen and invert onto a sheet pan lined with parchment. peel off all the paper and cut into serving size slices. sprinkle a little more grated parmesan on top and bake in a 350 degree oven 15 to 20 minutes until sizzling hot and crispy on top. And then just try to keep your fingers off of it until dinner time!