Home Articles How to Thicken Mashed Potatoes (7 Simple Ways)

How to Thicken Mashed Potatoes (7 Simple Ways)

by insanelygood
Mashed Potatoes

When it comes to sides, there’s nothing like some good old mashed potatoes. They’re super simple to make but also super delicious and an excellent pair for many main dishes.

But, not all mashed potatoes are created equally. I love mine to be rich, smooth, buttery, and most importantly, thick!

Nobody likes soggy, soupy mashed potatoes. But if you’ve made a little mistake and made them a little too runny for your taste, don’t worry! You don’t have to throw them out just yet.

Here are some tips to save your mashed potatoes and make them the best and thickest you’ve ever had.

Heat on a Stovetop

One way to thicken mashed potatoes is to add more heat. In a large pot, heat the runny mashed potatoes over low to medium heat. Stir occasionally to prevent it from sticking to the bottom of the pot.

Follow these tips when heating on a stovetop.

  • When stirring runny mashed potatoes, use a fork instead of a spoon or a ladle. This helps to avoid too much stirring and will allow excess liquid or moisture to evaporate more quickly.
  • Be careful not to stir too much! Overworking the potatoes can ruin the texture and make it too sticky or even gluey.
  • Don’t cover the pan! You might think that more heat will thicken the potatoes faster but we actually want excess moisture to have room to escape so keep the pot uncovered.

Heat in an Oven

Another way to thicken mashed potatoes is by baking it in an oven as adding heat allows the excess liquid to dissolve or evaporate.

Follow these steps to save your potatoes.

  • Preheat your oven to 300F.
  • Once your oven is heated, place the mashed potatoes in an uncovered bowl or pan.
  • Bake your potatoes for 15 minutes or until all the excess moisture has dried out.

Heat in a Microwave

For the quickest way to add heat to soupy mashed potatoes, you can also pop them in the microwave for just a few minutes. The best thing about this method is you can enjoy excellent, thick mashed potatoes sooner!

Here’s how to do it.

  • Place your mashed potatoes in an uncovered bowl and microwave on high for 1 minute. Make sure your container is microwave safe!
  • After a minute, take out the bowl to lightly stir and check if there is less moisture.
  • Repeat these steps until your potatoes are in the desired consistency.

Keep in mind that although this might be the quickest way to thicken the potatoes, you can only use this method for smaller amounts.


Another way to reduce the moisture in runny mashed potatoes is by straining. All you need is a cheesecloth and a strainer.

Follow these steps when straining.

  • Take a cheesecloth and pour your soupy potatoes in.
  • Tie the ends of the cheesecloth together tightly to remove moisture and form a ball of potato.
  • Place the cheesecloth over a strainer and leave for up to an hour.
  • Take out your strained and thick mashed potatoes and serve!

After straining the potatoes, it’s also a good idea to take the extra step of reheating them on a stovetop, oven, or microwave. This ensures that all extra moisture has dissolved and you can serve the matched potatoes warm!

Make sure to save the drained liquid. You can use it to make gravy or soup… Nothing goes to waste!

Bundle of Potatoes

Add More Potatoes

If you have extra potatoes, adding them to runny mashed potatoes will definitely thicken the consistency and might even make it taste better.

Here’s the best way to add potatoes.

  • Grate or shred your potatoes.
  • Cook the shredded potatoes in a pan to soften them.
  • Once softened, set aside to cool before draining with a cheesecloth and strainer.
  • Mash your potatoes with a fork.
  • Add this to the runny mashed potatoes.

Depending on how much potato you added, you may need to reheat. If you added a small amount, definitely heat everything again so you can enjoy your new and improved thick mashed potatoes warm!

Add Powdered Milk

As much as possible, if we only want to improve the texture of our mashed potatoes and not the flavor, we want to avoid adding other ingredients. But if they’re extra runny and heating didn’t work, you might have to add a thickening agent like powdered milk.

Many mashed potato recipes call for hot liquid milk. So in this case, powdered is a great alternative. Because milk is creamy and mild in flavor, this won’t affect the taste of your mashed potatoes too much but will make the texture a bit fluffier.

When adding powdered milk, make sure your runny mashed potatoes are warm so that it fully dissolves into the mixture.

Other thickening agents you can add that will have the least effect on flavor are flour and instant potato flakes.


Add Parmesan or Hard Cheeses

If you want to improve not only the texture of your mashed potatoes but the taste as well, adding flavorful thickening agents like cheese will definitely do the trick.

Parmesan is an excellent thickening agent. It has a versatile flavor that matches many other dishes including mashed potatoes. Pecorino is also a great option if you’re looking for an even stronger, more savory flavor.

With any cheese you add, make sure they are finely grated if you want the texture to be thick but also smooth.

How to Avoid Runny Mashed Potatoes

Taking all these extra steps to fix runny mashed potatoes can be quite time-consuming, especially when you’re hungry!

The next time you make this delicious side dish, keep these steps in mind for the perfectly thick and fluffy mashed potatoes.

  • Use the right potatoes! For the best mashed potatoes that have the right texture, use Yukon gold or Russet potatoes.
  • Start with cold water! When cooking your potatoes, start with cold water instead of placing them directly in boiling water. This will help them to cook more evenly.
  • Drain before adding other ingredients! After boiling your potatoes, make sure to drain them thoroughly before adding other ingredients, especially liquid.
  • Don’t underwork or overwork you potatoes! Not stirring enough will cause mashed potatoes to be too liquidy and stirring too much will make them stiff and starchy. So be gentle with your potatoes to keep them thick and fluffy.
How To Thicken Mashed Potatoes

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