This Is How to Thicken Runny Mashed Potatoes (2024)

Nobody likes runny mashed potatoes! Here's a handful of ways to fix those mashed potatoes into spuds good enough that people will ask for seconds.

ByCorey Williams

Published April 25, 2023

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This Is How to Thicken Runny Mashed Potatoes (1)

Never fret over a batch of“ruined” mashed potatoesagain. Here’s everything you need to know about thickening runny potatoes.

Why Are My Mashed Potatoes Runny?

There are quite a few reasons your mashed potatoes are watery. If you’re staring down at a bowl of white liquid and wondering what went wrong, ask yourself these questions:

  • Did I use soggy potatoes?It’s essential to drain and dry your potatoes well after you’ve cooked them in water. If you don’t, all that excess moisture will have nowhere to go once you start mashing.
  • Did I cook my potatoes too long?: Overcooked potatoes can be waterlogged.
  • Did I use too much liquid?This is an obvious issue. Make sure to read your recipe well and use the proper ratio of milk or cream to potatoes.

No matter how they happened, there are a few simple ways to fix your runny potatoes.

Add Dehydrated Potatoes

That’s right—you can thicken potatoes with potatoes! It's the easiest and fastest way, as long as you have them on hand. Here's the method recommended byDr. Potato at the Idaho Potato Commission: An “easy fix for watery potatoes is to break out theinstant dehydrated potatoesand mix them in a tablespoon at a time, into the wet potatoes. This usually will thicken them up.”

Add a Thickening Agent

This is the most common way to thicken mashed potatoes. You can use what you have on hand: Flour, cornstarch, or powdered milk are all solid options that are probably already in your pantry. Potato flour and potato starch would work as well.

Stir in the thickening agent gradually, about a tablespoon at a time, until the potatoes have reached your desired consistency. Be conservative, as too much thickener can lead to gluey mashed potatoes.

Reduce Them Over Heat

You can also thicken your mashed potatoes by continuing to cook them on the stove with the lid off. Heat draws the excess moisture out of runny potatoes, leaving you with a denser finished product.

This is a risky move, though, as overdone mashed potatoes are gummy and unpleasant. Make sure to keep a close eye on them if this is the method you choose.

As they cook, stir every so often sothey don’t stick to the bottom of the pot. But don’t stir too much! Overworking is another way to ruin the potatoes’ texture.

If your stove is full, you can use the oven to accomplish the same thing. Just place the potatoes in an uncovered, oven-safe casserole dish and heat them for about 10 minutes at 325 degrees F.

A version of this article originally appeared onMyRecipes.com

This Is How to Thicken Runny Mashed Potatoes (2024)

FAQs

This Is How to Thicken Runny Mashed Potatoes? ›

You can use what you have on hand: Flour, cornstarch, or powdered milk are all solid options that are probably already in your pantry. Potato flour and potato starch would work as well. Stir in the thickening agent gradually, about a tablespoon at a time, until the potatoes have reached your desired consistency.

How to thicken runny mashed potatoes? ›

Whisk a little cornstarch into the warm potatoes, only a teaspoon at a time, until the potatoes thicken to your liking. The potatoes must be warm. You can also use tapioca starch or potato starch, although most cooks are less likely to have those products on hand.

What happens when you put too much milk in mashed potatoes? ›

Runny potatoes can happen for a few different reasons. Too much liquid: This is the most common reason. In the mashing process you may have added too much milk or broth. Boiled too long: Boiling your potatoes for too long can make them water-logged, which (you guessed it) can contribute to runny mashed potatoes.

What thickens instant mashed potatoes? ›

Add a thickening agent

Flour, cornstarch and even powdered milk can thicken mashed potatoes quickly.

Does butter thicken mash? ›

You avoid thin mashed potatoes by first draining your boiled potatoes well and then not adding too much liquid. By themselves, potatoes mash quiet thick. Adding too much butter or liquid will thin them.

Why can't you add flour to mashed potatoes? ›

Regular flour can also be used to thicken your potatoes as well, but I don't love using it because its raw flavor needs to be cooked out, and it more noticeably dulls the flavor of the potatoes themselves.

How to make mashed potatoes thicker without cornstarch? ›

Add Dehydrated Potatoes

Potato at the Idaho Potato Commission: An “easy fix for watery potatoes is to break out the instant dehydrated potatoes and mix them in a tablespoon at a time, into the wet potatoes. This usually will thicken them up.”

Can I use milk instead of water for instant mashed potatoes? ›

Most instant potato varieties call for you to combine the potatoes with water, but if you want your potatoes to taste a bit more indulgent, use milk instead. Whole milk will yield delightfully rich potatoes, but 2 percent milk works well too.

How do you make mashed potatoes thinner? ›

Figuring out how to thin your mashed potatoes is a simple to fix. You just add warm liquid (milk, cream, or broth) a little at a time until you reached your desired consistency.

How to thicken stew without cornflour? ›

Alternatively, you can mix equal quantities of flour and butter (and/or oil) together to make a paste called 'beurre manie'. Whisk bits of the resulting paste into the hot stew where they will dissolve and disperse the flour. (This works better if you have lifted the meat or veg out of the gravy or sauce, first.)

Why do restaurant mashed potatoes taste better? ›

Garlic and herbs are added to boost flavor

Instead of boiling a few potatoes and mashing them plain, a lot of restaurant chefs like to apply a little more finesse. Garlic and herbs infused in butter and cream add a flavor boost without overpowering.

How do you reduce starch in mashed potatoes? ›

Let them soak in cold water overnight. After the soak, the water will be very cloudy because of the excess starch. Pour that water away and add fresh water.

Does cheese thicken mash? ›

To thicken mashed potatoes, add more cheese or cream cheese. Be sure to mix well with each bit you add. What toppings go well on cheesy mash? Quite a few toppings will help elevate these mashed potatoes even more, including a dollop of sour cream or an extra pat of butter.

How do you fix consistency in mashed potatoes? ›

Fix them: Scoop the watery mashed potatoes into a pan and stir constantly over low heat to evaporate the excess liquid. If the potatoes are really watery, you can add either cornstarch or instant mashed potatoes a half teaspoon at a time to help the spuds thicken to your preferred consistency.

How do you moisten mashed potatoes? ›

You can use milk, cream, half-and-half, tangy buttermilk, or chicken or vegetable stock to rehydrate your mashed potatoes. Start with ½ cup of liquid for 4 cups of mashed potatoes, and add it gradually so you don't end up with potato soup. Adding extra butter is a good idea, too.

How to remove moisture from boiled potatoes? ›

The water must be boiling before they are put in, and a little salt is added. When fully cooked the water is poured off, then the kettle or pot is placed on the stove, with the lid removed, to allow the moisture to evaporate. By this method of cooking potatoes, I have never failed to render them dry and mealy. MES.

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