"In this recipe, Yukon Gold potatoes and sweet potatoes are roughly mashed together with leeks for a beautiful mottled white-and-orange take on mashed potatoes. The creme fraiche topping offers a tangy counterpoint...."
INGREDIENTS
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1 tablespoon buttermilk plus 2/3 cup, divided
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2 tablespoons crème fraîche or sour cream
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1/2 teaspoon onion powder or granulated onion
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Pinch of salt plus 3/4 teaspoon, divided
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1 1/2 pounds Yukon Gold potatoes, cut into 1-inch chunks
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1 1/2 pounds sweet potatoes, peeled and cut into 1-inch chunks
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1 small leek, halved lengthwise and thinly sliced, white and light green parts only
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2 tablespoons butter, cut into 4 pieces
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1/4 teaspoon freshly ground pepper
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2 tablespoons minced fresh chives