The oven is your reliable buddy. It’s the friend who shows up with a bottle of wine and says, “Let’s take our time.” Preheat it to 350°F. Nothing fancy.
Scoop your cold potatoes into an oven-safe dish. Spread them out so they’re not a big, thick mountain. A thin layer is the secret to even heat.
Dot the top with a few pats of butter. Just a few. Cover it tightly with foil. This traps the steam, which is like giving your potatoes a little spa treatment in there. Bake for about 20 minutes, then give them a good stir.
The result is perfect. They’re warm, creamy, and taste like you just made them. It’s the “I have my life together” move of leftovers.
How to Reheat Mashed Potatoes