INGREDIENTS
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5 pounds baking potatoes (such as russets), peeled and cut into 2-inch chunks
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8 ounces cream cheese, cut into chunks, at room temperature
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1 cup sour cream
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1/2 cup whole milk
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1/2 cup (1 stick) unsalted butter (6 tablespoons at room temperature, 2 tablespoons cut into small cubes), plus extra
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Kosher salt and ground black or white pepper