INGREDIENTS
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8 tablespoons unsalted butter, cut into tablespoons, divided
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6 tablespoons all-purpose flour
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3 cups whole milk
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3/4 pound shredded Gruyere cheese, divided
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1/4 pound shredded white cheddar, divided
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1 cup chicken stock
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4 pounds Yukon gold potatoes, peeled and cut in uniform 1/8-inch thick (or slightly thinner) slices
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1 cup parmesan cheese shreds
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Freshly ground black pepper to taste