INGREDIENTS
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1 tablespoon unsalted butter, room temperature
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2 1/2 pounds Yukon Gold potatoes
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2 1/2 cups heavy cream
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1 1/2 cups whole milk
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1 garlic clove, smashed
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1 teaspoon coarse salt
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1/4 teaspoon ground white pepper
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4 ounces Gruyere cheese
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1/8 teaspoon freshly grated nutmeg