INGREDIENTS
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2 tablespoons unsalted butter, plus more for the dish
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Kosher salt
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3 pounds Yukon gold potatoes, peeled and thinly sliced
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2 tablespoons all-purpose flour
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1 cup low-fat milk (1%), at room temperature
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1 cup whole milk, at room temperature
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Freshly ground pepper
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1/4 teaspoon freshly grated nutmeg
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1/4 cup grated gruyere cheese
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