Can You Reheat Mashed Potatoes?

Yes, you can reheat mashed potatoes, and they come back very well if you add a small amount of butter, cream, or milk before applying heat. Mashed potato that is reheated dry turns gluey and stiff; adding fat and dairy loosens the starch and brings the texture back to smooth and creamy.

Can You Reheat Mashed Potatoes?

Yes. Mashed potatoes keep in the fridge for three to four days in a sealed container. Like all potato dishes, they should be refrigerated within two hours of cooking. Reheat to 75°C (165°F) throughout. The food safety risk is low; the quality risk is higher: mashed potato starch retrogrades overnight and the texture will be noticeably stiffer the next day, which is why adding liquid before reheating is not optional but necessary.

Why Mashed Potatoes Go Stiff Overnight

When potatoes are cooked and mashed, the starch granules burst and release starch into the surrounding fat and dairy. As the mash cools and sits in the fridge, those starches retrograde: they partially recrystallise and bind together. This is the same process that makes rice and risotto firm when cold. The result is a stiffer, drier texture. Reheating reverses it, but only if there is enough moisture and fat present to allow the starch network to loosen back up.

Reheating Mashed Potatoes on the Stovetop

The best method for large quantities and for getting full control of the final texture.

1. Add the mashed potato to a saucepan over medium-low heat.
2. Add two to three tablespoons of butter and two to three tablespoons of cream or milk per two cups of mash.
3. Stir continuously as it heats. The mash will loosen gradually as the temperature rises and the added fat distributes.
4. If it still looks too stiff, add another tablespoon of cream and keep stirring. Do not add cold liquid: it shocks the starch and can cause lumps.
5. Season again before serving. Salt fades during refrigeration and mash always needs a little more than you expect.

Reheating Mashed Potatoes in the Microwave

Fast and effective for single portions. The key is the same: add liquid first, and stir during heating.

1. Transfer a portion to a microwave-safe bowl.
2. Add a tablespoon of butter and a tablespoon of cream or milk. Stir them through before heating.
3. Cover loosely.
4. Microwave on full power for 60 seconds.
5. Stir thoroughly. This is critical: the mash heats from the outside in and stirring redistributes temperature and fat.
6. Add 30-second bursts until hot throughout, stirring after each.

Reheating Mashed Potatoes in the Oven

Good for very large quantities or when reheating as part of a dish (shepherd’s pie topping, for example).

1. Spread in an oven-safe dish.
2. Dot the surface with butter and add a splash of cream.
3. Cover with foil and bake at 175°C (350°F) for 20 to 25 minutes.
4. Remove the foil for the last five minutes and run under the grill briefly if you want a lightly browned top.

Which Method Should You Use?

Q: As much as I love instant mashed potatoes, I can never make the right amount for my family. Every time I make them, have enough to feed an army. Typically, I have to make them into another dish, but lately I have been wondering, I can I reheat them on their own?

A: The method you choose to reheat your mashed potatoes will vary on how much you have left over. There are two suitable methods; both give wonderful fluffy results.

The Microwave Method

Depending on how much you have left over, you should be able to microwave it. If you have a five person (or less) serving, you can easily microwave it. To do so, simply scoop the mashed potatoes into a microwave safe dish and stir to break it up. Add two tablespoons of milk or water for every two cups of potatoes. Microwave, covered, on high for two minutes and 30 seconds, stir, and continue heating until warm. This cross can take about five minutes, depending on the amount and density of the potatoes.

The Oven Method

When you have many mouths to feed, using the oven to reheat leftover mashed potatoes is great! Simply preheat your oven to 350 degrees F, grease a baking dish, and smooth your mashed potatoes evenly throughout. Tightly wrap with aluminum foil, and bake for 30-45 minutes until all the way warmed through. It may help make the process faster if you stir it halfway through cooking.

No matter what the season is, mashed potatoes are great with just about any meal. So instead of throwing these away, find a way to make your leftovers into another meal, or as a delicious side dish for another main course. Don’t forget to doctor them up to change the flavor or serve it with gravy!