With paring knife, cut a thin slice lengthwise off the top of each potato and discard. Using a spoon, scoop out all but 1/2-inch potato flesh from inside skin. Transfer to a bowl and add 1 cup sour cream, 1/4 cup milk, 3 Tbs. butter, and 1/4 cup snipped chives; mash until combined. Season with coarse salt and ground pepper. Spoon mixture into potato skins. Bake until lightly browned on top, 20 minutes. Serve sprinkled with more chives.
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