"These truffle-like cookies have an unexpected piece of candy in the centers. They're adapted from a traditional holiday cookie that Renato Poliafito discovered during his travels in Germany...."
INGREDIENTS
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2 cups all-purpose flour
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1 tablespoon unsweetened cocoa powder
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1/2 cup sugar
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1/8 teaspoon salt
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1 stick plus 6 tablespoons (7 ounces) unsalted butter, softened
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1 large egg yolk
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40 mini peanut butter cups and or 20 fun-size Mounds bars, cut in half
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4 ounces bittersweet chocolate, chopped
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4 ounces white chocolate, chopped
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Sprinkles, dragees or nonpareils, for garnish