INGREDIENTS
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6 tablespoons butter, divided
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4 tablespoons flour
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2 cups milk, half-and-half, or light cream
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kosher salt and white pepper or freshly ground black pepper
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2 pounds Yukon gold or red-skinned potatoes, diced and cooked until just tender
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1 cup shredded Gruyere or Swiss cheese, or a mild cheddar
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1 cup soft bread crumbs