Instructions: Preheat oven to 350. In a large bowl, whisk together the confectioners sugar, the walnuts, the cocoa powder and the salt, add the egg whites and the vanilla, and stir the mixture until is combined well. Form rounded tablespoons of the mixture into balls, put the balls on baking sheets lined with parchment paper, and with the bottom of a glass press them gently into disks. Bake the cookies in batches in the oven for 15 to 17 minutes, or until the tops appear dry and the cookies are lighter in color, and transfer them to racks to cool.

Makes about 30 cookies.

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