INGREDIENTS
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2 pints mint chocolate chip ice cream, softened slightly
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3/4 cup unsalted butter, room temperature
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1/2 cup plus 2 tablespoons sugar
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1 large egg yolk
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1 teaspoon vanilla extract
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1 1/4 cups all purpose flour
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1/4 cup unsweetened cocoa powder (preferably Dutch-process)
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1/4 teaspoon salt
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good-quality white chocolate (such as Lindt or Baker's), chopped