INGREDIENTS
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1 c. heavy cream or half and half
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1/4 c. low-sodium chicken broth
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1 pinch paprika
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1/4 tsp. ground nutmeg
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2 tbsp. fresh thyme leaves, plus more for garnish
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2 tbsp. freshly chopped rosemary, plus more for garnish
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2 tsp. garlic powder
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3 lb. russet potatoes, sliced 1/4" thick
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1/2 c. freshly grated Parmesan
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2 1/2 c. shredded Gruyère
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kosher salt
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Freshly ground black pepper