Mashed Potatoes by Kitchn

water, russet potatoes, half-and-half or whole milk, butter, kosher salt, black pepper, chives, unsalted butter

– 1 1/2 cups water
– 4 pounds russet potatoes, peeled
– 2 cups half-and-half or whole milk, warmed
– 8 tablespoons (1 stick) unsalted butter, at room temperature
– 2 teaspoons kosher salt
– Freshly ground black pepper (optional)
– 1 tablespoon unsalted butter, at room temperature
– 3 tablespoons half-and-half or whole milk
– 1 tablespoon chopped fresh chives
– 2 tablespoons cold unsalted butter