INGREDIENTS
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3 to 3 1/2 pounds russet potatoes, peeled and sliced ⅛ inch thick on a mandoline slicer (5 to 6 medium potatoes)
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1 tablespoon unsalted butter, room temperature
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2 1/2 cups heavy cream
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3 garlic cloves, minced
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1 tablespoon fresh thyme leaves, roughly chopped
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Kosher salt and freshly ground black pepper
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4 ounces Gruyère, finely grated
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2 ounce Parmesan cheese, finely grated
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1 tablespoon diced chives for garnish