Tangy, Creamy Buttermilk Mashed Potatoes
Buttermilk mashed potatoes sound fancy, but they come together with the same motions as classic mashed potatoes. The difference is all in the tang, which cuts through rich meals and makes the potatoes taste lively instead of heavy.
If you have a pot and a masher, you are 30 minutes from a side dish that tastes more interesting than the usual butter-and-cream bowl. These are the potatoes you want next to roast chicken, meatloaf, or a slow-braised short rib.
Why These Buttermilk Mashed Potatoes Are So Good
The buttermilk does two things at once: it loosens the potatoes into a silky texture and adds a clean, slightly sour back note. You still get all the richness from butter, but the finish is bright instead of cloying.
Using Yukon Golds keeps the mash creamy without needing a ton of liquid. And drying the potatoes briefly after boiling removes the water that makes a mash gluey, so the buttermilk and butter soak right in.
That tangy edge also means the leftovers reheat better. A splash of milk the next day brings them back to life without losing that character.
Ingredients
- 3 lbs Yukon Gold potatoes, peeled and cut into 2-inch chunks: their medium starch level gives a creamy, not gummy, mash.
- 1 cup buttermilk, at room temperature: full-fat buttermilk has the best tang and consistency.
- 4 tbsp unsalted butter, cubed and softened: plus a little extra for the top.
- 1 ½ tsp kosher salt, divided: Diamond Crystal; if using fine table salt, start with half and adjust.
- ¼ tsp freshly ground black pepper: optional, but a little bite rounds out the tang.
Variations / Substitutions
- Garlic: roast a whole head of garlic, squeeze out the soft cloves, and mash them in with the butter for a mellow, savory depth.
- Herbs: stir in a handful of chopped chives or parsley just before serving for a fresh green note.
- Dairy-free: use unsweetened oat milk with a teaspoon of lemon juice in place of buttermilk, and a good plant-based butter.
You might also like garlic mashed potatoes if you want a bolder allium flavor.
How To Make Buttermilk Mashed Potatoes
Step 1: Boil the Potatoes
Put the potato chunks in a large pot and add enough cold water to cover them by about an inch. Stir in 1 teaspoon of the kosher salt. Set the pot over high heat, bring to a boil, then lower the heat to a steady simmer. Cook until a paring knife slides in with barely any resistance, about 12 to 15 minutes.
You want them fork-tender but not disintegrating. If they start to break apart, they’ll take on water, so check a couple minutes early.
Step 2: Drain and Dry the Potatoes
Set a colander in the sink, drain the potatoes, and immediately return them to the hot pot. Put the pot back over low heat and let them sit for 1 to 2 minutes, shaking the pot once or twice. The residual heat drives off steam, which dries the surface of the chunks.
They’ll look slightly chalky around the edges, and the pot will stop releasing steam. This step is the easiest way to avoid a watery mash.
Step 3: Mash with Butter and Buttermilk
With the pot still off the heat, add the 4 tablespoons of softened butter and begin mashing right away. Work the butter into the hot potatoes until it melts and the chunks start breaking down. Then slowly pour in about half of the 1 cup of room-temperature buttermilk, mashing and folding as you go. Keep adding buttermilk a splash at a time until the mash is as loose as you like.
Mash gently and stop as soon as everything is combined. Overworking or using an electric mixer can turn the starches gluey. A ricer gives the smoothest result, but a hand masher works beautifully for a rustic texture.
Step 4: Finish and Serve
Season the mash with the remaining ½ teaspoon kosher salt and the black pepper, then taste. Add a pinch more salt if the tang still feels a little flat. Spoon into a warm serving bowl and top with an extra pat of butter and a grind of pepper.
Serve the potatoes straight away while they’re steaming, or keep them covered over a pan of warm water for a few minutes. They stay creamy and loose longer than cream-based mashes.
A Few Notes Before You Start
- Cold buttermilk can seize up the butter and make the mash stiff. Pull it from the fridge when you start peeling the potatoes so it loses the chill.
- If you prefer a fluffier, more rustic texture, use Russet potatoes. They absorb the buttermilk eagerly but give a less dense result.
- For an even brighter tang, hold back a tablespoon of buttermilk and stir it in right before serving.
Scaled amounts for different batch sizes:
| Servings | Potatoes | Buttermilk | Butter | Salt (kosher) |
|---|---|---|---|---|
| 2 | 1 ½ lbs (2 large) | ½ cup | 2 tbsp | ¾ tsp, divided |
| 4 | 3 lbs (4-5 medium) | 1 cup | 4 tbsp | 1 ½ tsp, divided |
| 8 | 6 lbs (8-10 med.) | 2 cups | 8 tbsp (1 stick) | 1 tbsp, divided |
Storing and Reheating Leftovers
Refrigerate any leftovers in an airtight container for up to 4 days. The tang holds up better than plain dairy, so they don’t taste flat the next day.
Reheat gently on the stovetop with a splash of milk or buttermilk over low heat, stirring often, until warm. The microwave works too, but go in 30-second bursts and stir between them. Freezing changes the texture, so it’s best to skip it.
What Goes Well With Buttermilk Mashed Potatoes
This mash’s tangy edge pairs beautifully with rich, savory mains. Slide a pool of it next to garlic-rosemary roast chicken, and the bright flavor cuts through the crispy skin. It’s just as good under a ladle of beef stew, where the creamy texture soaks up the broth. For a weeknight, try it with a simple pan-seared pork chop and sautéed greens—the mash brings a zingy contrast that keeps the plate from feeling heavy.
Frequently Asked Questions
Can I make these mashed potatoes ahead of time?
Yes. Mash them as directed, then cool and refrigerate. Reheat over low heat with a little extra buttermilk or milk, stirring gently, until hot.
What’s the best potato for buttermilk mashed potatoes?
Yukon Golds give a naturally creamy mash with a buttery color. Russets yield a fluffier, more old-school texture that drinks up the buttermilk.
Why did my potatoes turn out gluey?
That happens when the potatoes are over-mashed or processed with a blender or food processor. The starch cells rupture and release a paste-like consistency. Hand mashing or a ricer prevents this.
Can I use a food processor or hand mixer?
It’s not recommended. Both beat the starch too aggressively and create a dense, gummy mash. A ricer or hand masher gives you control and a much better texture.
How do I fix mashed potatoes that are too loose?
Place the pot back over low heat, stir gently, and let the extra moisture steam off for a minute or two. Then re-taste for salt.
Buttermilk Mashed Potatoes Recipe
Ingredients
Method
- Place potatoes in a large pot, cover with cold water by 1 inch, stir in 1 tsp salt. Boil, then simmer until fork-tender, 12 to 15 minutes.
- Drain potatoes, return to pot over low heat, and dry for 1 to 2 minutes, shaking occasionally.
- Add butter and mash until melted. Gradually stir in buttermilk until smooth and creamy.
- Season with remaining ½ tsp salt and pepper, adjust to taste, and serve hot with a pat of butter.
