"They're irresistibly light and fluffy...."
INGREDIENTS
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6 tablespoons unsalted butter, plus more for the baking dish
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2 1/2 pounds Yukon gold potatoes
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2 tablepoons kosher salt
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2 ounces Parmesan cheese, finely grated (about 1/2 cup)
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1/2 cup whole milk
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1 cup cold heavy cream
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