""This luscious gratin strikes a happy middle chord for those hungry for potatoes and those vying for a sweet potato casserole." --Nancy Vienneau, author of Third Thursday Community Potluck Cookbook, from which this recipe was adapted...."
INGREDIENTS
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2 shallots, diced
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1/4 cup butter, divided
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2 cups heavy cream
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2 tablespoons chopped parsley
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1 tablespoon chopped chives
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1 teaspoon kosher salt
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1/2 teaspoon ground white pepper
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1/8 teaspoon freshly grated nutmeg
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1 1/2 pounds Yukon gold potatoes
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1 1/2 pounds sweet potatoes
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2 cups milk
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1 1/2 cups (6 oz.) shredded Gruyère cheese
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1/4 cup grated Parmesan cheese