"Nutty, crumbly, airy and yet dense, these melt-in-your mouth cookies are almost impossible to stop eating...."
INGREDIENTS
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1 cup unsalted butter, at room temperature
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2 cups all-purpose white flour
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1/4 cup confectioners' sugar, plus additional for rolling
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2 cups walnut halves, lightly toasted, cooled and finely ground
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1 teaspoon vanilla extract