In the morning before preparing the Potatoes Romanoff, bake the potatoes for 1 hour in a 375℉ oven.
Cool the potatoes, cover, and refrigerate for at least 8 hours.
When ready to prepare the Potatoes Romanoff, Preheat the oven to 425℉.
Using a box grater, shred the potatoes, skins and all, into a medium sized mixing bowl.
In a small saucepan over medium heat, melt the butter.
Add the minced shallot and minced garlic clove. Sauté until tender.
Add the sauteed shallot, minced garlic, and melted butter to the mixing bowl with the shredded potatoes.
Add the cayenne, sea salt, and black pepper to the mixing bowl and gently stir to combine but not break up the shredded potatoes.
Add the shredded white cheddar and gently stir again.
Finally, add the sour cream and gently stir.
Pour the prepared potatoes into a 2 quart baking dish and smooth out the top surface.
Bake for 30 minutes.
Remove the baking dish and allow to cool for 5 minutes before serving.
This dish can be refrigerated for up to 4 days and reheated in the microwave or oven at 425℉ for 20-25 minutes. It can also be prepared up to 2 days prior to baking.