INGREDIENTS
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3 ounces shredded Gruyère cheese
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2 ounces shredded Parmigiano-reggiano
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4 ounces cubed pancetta, cooked
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2 cups heavy cream
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4 garlic cloves, roughly chopped
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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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3 pounds russet potatoes, peeled and sliced 1/8th-inch thick on a mandoline slicer