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How to reheat mashed potatoes 
Thaw your mashed potatoes. 
To serve reheated potatoes that are as moist as a freshly cooked dish, allow your potatoes to thaw first if you've frozen them. This way you can stir in additional cream more easily.
If you reheat frozen potatoes straight from the freezer, allow extra cooking time in the beginning until they've warmed and softened enough to stir the cream in effectively. Use a pan on your stovetop.