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Export 3 ingredients for grocery delivery
Step 1
Toss together the potatoes, melted butter, salt and a generous amount of black pepper in a 6- to 8-quart slow cooker. Cook on high until the potatoes are very tender, stirring once or twice if possible to encourage even cooking, about 4 hours.
Step 2
Add the sour cream and remaining 3 tablespoons butter and mash the potatoes with a masher until they are smooth and creamy. Just before serving, fold in the chives and season again with black pepper. Taste and add more salt only if necessary.