"Potatoes are the Maine ingredient in this favorite old-fashioned candy...."
INGREDIENTS
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1 2-pound bag confectioners’ sugar
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3/4 cup plain mashed potato, warm
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1/2 cup (1 stick) unsalted butter, melted, plus more for pan
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1 14-ounce bag sweetened flaked coconut
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2 teaspoons vanilla extract
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1/2 teaspoon table salt
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4 ounces unsweetened chocolate
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1 12-ounce bag semisweet chocolate chips
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2 tablespoons vegetable shortening