Transfer the mashed potatoes to a large microwave-safe bowl and cover tightly with plastic wrap. Refrigerate for up to 2 days. To reheat, poke lots of holes in the plastic wrap with the tip of a knife and microwave at medium-high (75 percent) power for about 14 minutes.
If you refrigerated your mashed potatoes in an oven-safe casserole dish, set them out on the counter to take the chill off for at least 20 minutes before you pop them into the oven. When you're ready, bake, covered, at 350 degrees for 15 to 20 minutes, or until the potatoes are hot throughout.
Whether reheating leftovers or using a recipe to make mashed potatoes ahead of time for a crowd, warming those spuds in a double boiler will do the trick. Alternatively, you can place your potatoes in a Pyrex glass bowl set over (but not in) simmering water.
Take your mashed potatoes out of the fridge and set them on the counter for about 20 minutes to bring them to room temperature. Meanwhile, preheat the oven to 350°F. Then, pop them in the oven, covered, for about 15-20 minutes, or until warmed through.
Reheat on the Stovetop
She says to store them in a heatproof bowl after cooking; when it's time to warm them up, place the bowl over a pot of simmering water. Add an extra splash of cream or milk, and another pat of butter to ensure the mashed potatoes don't dry out.
Mashed potatoes can be kept warm in a crockpot (if serving later the same day) OR refrigerated for up to 2 days. To reheat, place them in a large pot over medium-low heat, stirring constantly and adding additional milk/cream as needed to achieve the desired consistency.
So, what is the best way to reheat mashed potatoes? The best way to reheat mashed potatoes is to heat them covered in the oven at 350 degrees with extra milk and butter. Cook for 20 minutes or until warmed through. Don't worry if you don't have the time or means to heat your leftover potatoes in the oven.
To reheat mashed potatoes in the oven:
Add a bit of butter, milk, or cream for extra moisture. Cover the dish with foil and bake for 10-15 minutes, stirring gently every 5 minutes. Once your bowl of potatoes is hot, at least 165°, you can serve and eat.
Spoon the potatoes into the serving dish, if you are serving the dish family style. Use the back of the spoon to smooth and round the pile of potatoes. If you are plating the potatoes in the kitchen, leave them in the mixing bowl or pot and cover the bowl with aluminum foil until you are ready to serve.
Make-ahead mashed potatoes are a great option for the holidays. You can do nearly everything — boil, peel, and mash; stir in milk and salt — up to two days ahead. Before serving, reheat. Adding butter at the last minute makes them taste freshly mashed.
The whole process is simple: peel them, leave them whole or dice them if you want, fill a bowl with cold water, submerge the potatoes and store in the fridge overnight. While this trick can be quite handy, it will only work for about 24 hours, so we would recommend to not prep your potatoes too far in advance.
Reheat a Baked Potato in the Oven
Preheat the oven to 350°F and take the potatoes out of the fridge to reach room temperature. Place the potato on a baking sheet or directly on the oven rack to achieve a crispy skin—Bake for 15 to 20 minutes or until the potato is thoroughly heated.
Reheat in the oven: cover mashed potatoes with foil and reheat at 375 for 30-40 minutes. Reheat in a slow cooker on medium low, add them to your slow cooker and mix in a little more cream and butter to keep them moist. Stir every 15 minutes until hot. Keep the temperature on low setting.
Reheating mashed potatoes in a slow cooker or Crockpot ⇢ Making use of a slow cooker or Crockpot is a great option if you're low on oven space on Thanksgiving Day! Transfer the potatoes to your slow cooker & reheat with the low setting for 3-4 hours.
Previously cooked and cooled Time/Temperature Control for Safety (TCS) foods that will be HOT HELD must be reheated as follows: *All parts of the food must reach a temperature of at least 165°F for 15 seconds.
Mashed potatoes can sit out for two hours at room temperature. Any longer than that, they can enter the “danger zone,” which are unsafe temperatures that promote the growth of bacteria. If temperatures go above 90 °F, mashed potatoes can only sit out for one hour.
Keep Your Potatoes Hot
If you want a truly creamy taste and texture, you can't let the potatoes cool before mashing—you want to start getting busy with them as soon as possible after they've been boiled and drained.
If this occurs, the outlet recommends correcting course with more fat: Adding more liquid in the form of melted butter, extra-virgin olive oil, cream, or full-fat milk.
Just bring some water in a large pot to a boil, then put in the pot with your mashed potatoes in it. Stir until they're smooth and evenly reheated. If you're familiar with double-boiling, or the best way to melt chocolate, this will look familiar to you.
How long do mashed potatoes last in the fridge? Mashed potatoes stored in an airtight container last 3-5 days in the refrigerator. But, keep in mind, that recipes with added dairy like butter, milk, or sour cream may go bad more quickly than plain potatoes.
How much Mashed Potatoes should you make? As a side dish, you should plan on ½ pound of potatoes per person. That means if you are planning on 10 people, use 5 pounds of potatoes.
A typical serving of potatoes in 1/2 pound per person. So you will need approximately 2 pounds of potatoes to feed 4 people. This amount will vary depending on whether it's a side dish or a main dish. If you're serving baking potatoes (jacket potatoes), you'll need one 1lb baking potato per person.
Adding cold dairy to your mashed potatoes also cools the mash down — and very few people like cold mashed potatoes. Ready to put this tip into action? Bring the milk and butter to at least room temperature or, better yet, gently heat them on the stovetop before adding them to your potatoes.
Nothing should go in cold. Indeed, butter will mix better if it's at room temperature, so leave it out to warm up while the potatoes tenderize in the water. Milk or cream should be warmed to prevent them from seizing the potatoes if added immediately after the cooking process.