INGREDIENTS
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1 1/2 cups heavy cream
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1 sprig fresh thyme
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2 garlic cloves, chopped
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1/2 teaspoon ground nutmeg
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Butter
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1 lb russet potatoes, peeled and cut into 1/8-inch thick slices
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1 lb sweet potatoes, peeled and cut into 1/8-inch thick slices
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Salt and freshly ground black pepper
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1/2 cup grated Parmesan, plus more for broiling