I would like to bake the potatoes for twice baked potatoes a day ahead of time since my oven will be in use the day of my dinner.  After I have hollowed out the potatoes and prepared the stuffing, what is the best way to reheat the shell before returning the prepared potatoes to it?

How many for dinner? If just a few I would bake off the day before to 185°F, cool, scoop out the potato insides, mix with sour cream and cheese, place back into the potato and then refrigerate. Then you can reheat the potatoes individually in the microwave.

Do you have access to a BBQ grill? If so, you can always place on a top rack and warm them up that way. 

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