"Outrageously rich, serve these mashed potatoes to guests or on holidays...."
INGREDIENTS
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4 Yukon Gold potatoes, peeled and cubed
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1 1/2 pounds celery root, peeled and cubed
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3 tablespoons butter
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1/3 cup sour cream or plain yogurt, room temperature
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4 ounces mascarpone, Italian-style cream cheese or conventional cream cheese, room temperature
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1 teaspoon salt
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freshly ground black pepper