Parmesan Skin-On Mashed Potatoes

Ingredients

• 3 lbs russet or Yukon Gold potatoes, skin-on, scrubbed clean and cut into 1.5-inch chunks
• 2 tbsp kosher salt, for the boiling water
• 6 tbsp unsalted butter, cut into 1-inch cubes, at room temperature
• 1/2 cup whole milk, warmed (not boiling)
• 1/2 cup full-fat sour cream, at room temperature
• 1/2 cup finely grated Parmesan cheese, plus more for serving
• 1 1/2 tsp kosher salt, for seasoning
• 1/2 tsp freshly ground black pepper
• 1/4 tsp garlic powder (optional, for depth)

Instructions

1. 1

   Scrub the potatoes thoroughly under cold running water to remove any dirt from the skins. Do not peel — the skins are a key part of this recipe's texture and flavor. Cut the potatoes into roughly uniform 1.5-inch chunks so they cook evenly. Place the cut potatoes in a large 6-quart pot.

2. 2

   Cover the potato chunks with cold water by at least 1 inch — starting in cold water ensures even cooking from the outside in. Add 2 tablespoons of kosher salt to the water; it should taste noticeably salty, like mild sea water. This is your only opportunity to season the potatoes from within.

3. 3

   Bring the pot to a full, rolling boil over high heat, which will take about 12–15 minutes. Once boiling, reduce heat to medium-high to maintain a vigorous simmer. Cook the potatoes uncovered for 18–22 minutes, until a fork slides effortlessly into the largest chunk with zero resistance and a piece falls apart when pressed against the side of the pot. Do not undercook — underdone potatoes result in lumpy mash.

4. 4

   While the potatoes cook, warm the milk in a small saucepan over low heat for 2–3 minutes until steaming but not boiling — you should see wisps of steam and it should feel hot to the touch. Warmed milk prevents the mash from cooling down and turning gluey. Set aside. Also remove your butter, sour cream, and Parmesan from the refrigerator now if you haven't already so they can come closer to room temperature.

5. 5

   Carefully drain the cooked potatoes through a colander set in the sink. Let them steam-dry in the colander for 2–3 minutes — this is critical. Shaking the colander gently helps release excess moisture, which would make your mash watery. You want the surface of the potato pieces to look dry and slightly chalky.

6. 6

   Transfer the hot, drained potatoes to the bowl of a stand mixer fitted with the paddle attachment, or to a large mixing bowl if using a hand mixer. Add the room-temperature butter cubes immediately while the potatoes are still hot — the heat will melt the butter rapidly and help it emulsify into the starch. Beat on LOW speed for 30 seconds, just until the butter is incorporated and no large chunks remain. Do not over-beat — overworking releases too much starch and makes the potatoes sticky and gluey.

7. 7

   With the mixer still on low, slowly pour in the warm milk in a thin, steady stream, followed by the sour cream. Mix for another 30–45 seconds until just combined and creamy. The mixture should look fluffy, pale yellow, and swirled with pieces of potato skin — exactly the rustic, marbled appearance you see in the photo. Stop mixing the moment everything is combined.

8. 8

   Add the finely grated Parmesan cheese, 1 1/2 teaspoons kosher salt, 1/2 teaspoon black pepper, and optional garlic powder. Fold everything together gently with a rubber spatula using slow, sweeping motions from the bottom of the bowl up — resist the urge to stir vigorously. Taste the potatoes now: they should be rich, savory, slightly tangy from the sour cream, and umami-forward from the Parmesan. Adjust salt if needed, adding 1/4 teaspoon at a time.

9. 9

   Transfer the mashed potatoes to a warm serving bowl immediately — cold bowls will make the mash stiffen up quickly. Use the back of a large spoon to swirl the top decoratively. Finish with a light shower of additional grated Parmesan and a few cracks of freshly ground black pepper. Serve piping hot alongside your main course. If holding for more than 10 minutes before serving, cover the bowl tightly with foil and set it over a pot of barely simmering water (bain-marie style) to keep warm without drying out.

Tools you’ll need

• large pot (6-quart or larger)
• colander
• potato masher
• stand mixer with paddle attachment or hand mixer
• small saucepan
• cutting board
• sharp chef's knife
• measuring cups and spoons
• rubber spatula
• large mixing bowl (if not using stand mixer)

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