Put the potatoes in a saucepan; cover with cold water and add 2 tablespoons kosher salt. Bring to a simmer over medium-low to medium heat and cook, uncovered, until tender, about 45 minutes. Drain the potatoes and let sit until just cool enough to handle, then peel and transfer to a bowl.
Add the butter to the potatoes. Add the buttermilk, 2 teaspoons kosher salt, and pepper to taste; mash with a potato masher or fork.
Stir the parsley, dill and chives into the potatoes. Fold in the cheddar. Spoon the mashed potatoes into a serving dish.
Photograph by Yunhee Kim
Recipe courtesy Food Network Magazine
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