Homemade mashed potatoes that are too runny: the mistake is sometimes made long before you add the milk...

Let’s start with the most common problem. You mash your potatoes, add a little milk, and… disaster: the mashed potatoes turn out much too runny.

The instinct is often to think you’ve added too much liquid. But that’s not necessarily the case. The potatoes may have already absorbed a lot of water while cooking, especially if they were peeled and cut into small pieces before being added to the pot.

And naturally, if your base is already very moist, just a few spoonfuls of milk are enough to throw off the texture.

That’s where this method gets interesting. Instead of peeling the potatoes before cooking, cook them whole, with their skins on.

Why? Simply because the skin limits direct contact between the flesh and the water. As a result, the potatoes absorb less moisture during cooking.

Once they’re tender, drain them, let them cool just enough to handle, then peel them and mash them while they’re still warm.

This takes a few extra minutes at the start, but you gain a lot more control over the texture. And when you want a smooth mashed potato without turning it into soup, that’s really appreciated.

Another classic problem: mashed potatoes that become stretchy and almost stick to the spoon. In this case, the problem isn’t water anymore, but starch.

We know what you were thinking: “I’ll just give it a quick whirl in the blender to make it nice and smooth.” Except that the blades process the potatoes very quickly and release a huge amount of starch. The result? A sticky texture that’s more like glue than homemade mashed potatoes.

The right tool here is a potato masher, a food mill, or—for a small amount—a simple fork. The idea is to mash without overworking the mixture.

You mash, you keep at it, you try again… and there are still little hard chunks left? No need to keep hammering away at the utensil. The potatoes probably aren’t cooked enough.

For mashed potatoes, they need to be really tender all the way through. The tip of a knife should slide in easily, without any resistance.

If you’re cooking them whole with their skins on, try to choose potatoes that are roughly the same size. Otherwise, the smaller ones will be done long before the larger ones, and you’ll end up with uneven cooking.

You took the time to mash your potatoes while they were still hot… then you poured milk straight from the refrigerator over them. And of course, the temperature drops.

The right thing to do? Heat the milk before adding it. No need to boil it—it just needs to be warm.

Also, add the butter while the potatoes are still very hot so it melts easily. And if you make the mashed potatoes a few minutes ahead of time, keep them covered and warm rather than leaving them sitting on the counter.

Yes, all is not lost ;-)

If your mashed potatoes are just a little too runny, return them to low heat for a few moments and stir gently. Some of the moisture will evaporate.

Do you still have a cooked potato on hand? Mash it and then gradually stir it in. This makes much more sense than adding flour or cornstarch haphazardly, which risks completely changing the texture.

And above all, next time, add the milk little by little. You can always add more. Taking some out is much trickier.

Want to avoid having to figure it out all over again at every dinner? Just keep this order in mind:

1. Choose potatoes that are suitable for mashed potatoes.
2. Cook them whole, with their skins on.
3. Peel them while they’re still hot.
4. Mash them without using a blender.
5. Add the butter.
6. Gradually pour in the hot milk.

And there you have it. No need for complicated techniques or secret ingredients. The real difference lies mainly in the moisture content, the cooking method, and how you handle the potatoes.

Once you’ve mastered these three points, your mashed potatoes should be much less likely to throw you a curveball when it’s time to sit down to eat ;-)