INGREDIENTS
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1 1/2 pounds medium Yukon Gold potatoes
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1 1/2 pounds medium red-skinned sweet potatoes (yams)
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2 cups heavy whipping cream
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1/4 cup (1/2 stick) butter
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2 garlic cloves, minced
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1 tablespoon minced fresh Italian parsley
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1 tablespoon minced fresh rosemary
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1 tablespoon minced fresh sage
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1 tablespoon minced fresh thyme
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1 1/2 teaspoons fine sea salt
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3/4 teaspoon freshly ground black pepper
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1 1/4 cups (packed) coarsely grated Gruyére cheese (about 5 ounces)