This Brilliant Trick Transformed My Runny Mashed Potatoes — and Saved Thanksgiving (2024)

Christine Gallary

Christine GallaryFood Editor-at-Large

Christine graduated from Le Cordon Bleu in Paris, France, and she has worked at Cook's Illustrated and CHOW.com. She lives in San Francisco and loves teaching cooking classes. Follow her latest culinary escapades on Instagram.

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published Nov 6, 2023

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This Brilliant Trick Transformed My Runny Mashed Potatoes — and Saved Thanksgiving (1)

It happens to the best of us: In the hustle and bustle of cooking you’ve accidentally added too much liquid to your mashed potatoes and now they’re runny, not the fluffy mound you were dreaming of. How do you thicken runny mashed potatoes? No worries — you have a few different options. Here is how to whip those potatoes back into shape.

How Do Mashed Potatoes Get Runny in the First Place?

Maybe you already know the answer, or maybe cooking has been such a blur you’re wondering what just happened. 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.

Option 1: Add a Thickener

A thickening agent can come to the rescue — chances are, you have the answer to fixing runny mashed potatoes in your pantry. Adding a thickener can firm up your taters in a manner of seconds. Here are the ones we recommend.

Potato starch: This is the ideal thickening agent, and not just because it’s made from potato (although that sure does help). Potato starch has a lower gelatinization temperature — what that means for us is that it thickens food faster, and it results in a smooth, glossy texture. (It’s a handy pantry item to keep on hand for thickening other foods and sauces.)

Cornstarch: So you don’t happen to have potato starch in the pantry. In that case, cornstarch is a very good option. Like potato starch, it’s gluten-free, and it works quickly.

What we don’t recommend using is wheat flour. While it, too, can help thicken your potatoes, it will also give them a pasty flavor. Plus, the flour might not cook thoroughly in the process.

How to Add a Thickening Agent

For best results, add the thickener to warm but not hot potatoes. Make a slurry with the agent: In a small bowl, mix 1 tablespoon of the starch with 2 tablespoons of warm (not hot) water or broth until the starch is dissolved. Then stir the mix carefully into the potatoes over medium-low heat and stir gently until the potatoes thicken. Yes, you are adding more liquid to your potatoes, but in this case, the slurry will help distribute the starch so it doesn’t clump.

Option 2: Reduce with Heat

No thickeners? No problem. Help that extra moisture evaporate by heating your mashed potatoes.

Typically when you want to thicken a food like a sauce or gravy using heat, you reduce it over the stove while stirring. We don’t recommend this for mashed potatoes because they can get overmixed and gummy — plus they may stick to the bottom of the pan.

Instead, you can heat them in the oven. Spread the potatoes in a layer in a baking dish and bake uncovered in a 325ºF to 350ºF oven for 10 to 15 minutes.

Option 3: Add Potato Flakes

A third way to thicken runny mashed potatoes is to add … more potatoes, in the form of potato flakes. Instant mashed potatoes might not be your first choice for a holiday meal, but when added to fresh mashed potatoes, they can help thicken without detracting from the flavor.

Gently stir a tablespoon of potato flakes at a time into warm (not hot) potatoes until you reach your desired thickness. By the way, we’ve tested different brands of instant mashed potatoes and have a couple of recommendations for you.

Got another mashed potato emergency? Check out our list of the top mistakes people make when cooking mashed potatoes.

This Brilliant Trick Transformed My Runny Mashed Potatoes — and Saved Thanksgiving (2024)

FAQs

This Brilliant Trick Transformed My Runny Mashed Potatoes — and Saved Thanksgiving? ›

How To Fix Runny Mashed Potatoes. Whether you added to much liquid or over-mashed your potatoes, if you wind up with a soupy mess of gloop instead of fluffy, whipped spuds, we have a solution for you: Just add instant mashed potatoes (aka potato flakes). These little flakes are essentially dehydrated potatoes

dehydrated potatoes
Hoshiimo (干し芋) is a sweet potato snack popular in Japan similar to a number of other dried foods in Asia. This food generally consists of steamed, dried, sweet potatoes that are skinned and sliced with no artificial sweeteners added. In some cases, the sweet potatoes may be roasted rather than steamed.
https://en.wikipedia.org › wiki › Hoshi-imo
.

How to fix mashed potatoes that are too runny? ›

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 fix watery defrosted mashed potatoes? ›

If your thawed and heated mashed potatoes turn out a bit watery (it happens), whip in generous spoonfuls of sour cream or cream cheese to bring the texture back together. Your potatoes will be creamy rather than fluffy, but that's not a bad thing.

How do you keep mashed potatoes fresh for Thanksgiving? ›

Put the lid on your mashed potato pot and gently place the pot inside the simmering water bath. Leave the stove on and allow the water to simmer for as long as you need it to keep your potatoes warm. Not only will the water bath keep your potatoes warm, but it will also keep them light and fluffy.

How do you thicken mashed potatoes instantly? ›

If you have dehydrated potatoes in your pantry or cabinets, you can use them if you're unsure how to thicken mashed potatoes. Stir in 1 tablespoon of the instant potato flakes until your mixture reaches the desired consistency. While they can slightly alter the taste, they work wonders if you're in a pinch.

How do you make mashed potatoes moist again? ›

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 stop mashed potatoes from going soggy? ›

Potatoes cook best when they're boiled gently, not vigorously. Keep the lid off the pan when you're cooking them to monitor the boil. And when they're done, drain them well—extra liquid still clinging to the potatoes could make them soggy, too.

How do you stop potatoes going watery? ›

There are a few ways you can help avoid this:
  1. Boiling the potatoes with the skins on reduces the amount of water absorbed (and adds some of the flavour from the skins).
  2. Get the starch of the individual cells to gel before fully cooking. ...
  3. Use baked potatoes.
Dec 28, 2012

How to fix dry mashed potatoes? ›

If you skimp on the butter and cream, the side dish will suffer as a result, turning out unappealingly dry. 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.

How do restaurants keep mashed potatoes fresh? ›

Restaurants prepare the potatoes ahead by boiling and mashing just the potato, then just before serving, it is mixed into boiling cream (or milk or even broth or a combination thereof) to reheat it and make it nice and creamy.

How do I prepare potatoes the day before Thanksgiving? ›

You should store peeled and cut potatoes in water for 24 hours to ensure the quality of your final product. "If you drain the potatoes and notice they are turning brown, that they've started getting soft, or if they are slimy you should discard them," says Brigman.

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.

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.

Why are my frozen mashed potatoes watery? ›

The first thing to know about freezing mashed potatoes is that the process may affect their texture. "The liquid absorbed by the potatoes while cooking will form ice crystals when they are frozen," says Martha's Vineyard- and Boston-based personal chef Carlos Montoya. "This may make them mushy, soggy, or grainy."

How do you make mashed potatoes looser? ›

Simply add more milk and continue mixing until you get the consistency you want. You may want to add a bit more salt and butter as well to keep the flavor up. If you are making homemade mashed potatoes with real potatoes, make sure your potatoes are cooked all the way.

How do you revive dry mashed potatoes? ›

Add more cream and butter: More moisture and fat are the two secret ingredients to reheating any leftovers. For potatoes, reach for half-and-half or broth and butter.

How do you keep mashed potatoes from getting mushy? ›

Potatoes cook best when they're boiled gently, not vigorously. Keep the lid off the pan when you're cooking them to monitor the boil. And when they're done, drain them well—extra liquid still clinging to the potatoes could make them soggy, too.

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