INGREDIENTS
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2 cups walnuts, divided
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2 cups all-purpose flour
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¾ teaspoon salt
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16 tablespoons (2 sticks) unsalted butter, softened
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⅓ cup superfine sugar*
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½ of a vanilla bean
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1 ½ teaspoons vanilla extract
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½ cup mini chocolate chips
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1 ½ cups confectioners’ sugar