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In a food processor, pulse the flour, cocoa and salt. Add the butter and direction of except sandy, about 3 minutes. Add the confectioners’ sugar, milk and vanilla extract and direction of except a firm dough forms. Switch the dough to 2 sheets of plastic wrap and scheme into two 7-plug logs, about 1 1/2 inches thick. Wrap in plastic and refrigerate except very firm, at the least 4 hours or in a single day.
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Preheat the oven to 350° and say racks in the easier and lower thirds. Line 2 handsome baking sheets with parchment paper. Beat the egg white in a diminutive bowl. Sprinkle the granulated sugar in a 7-plug sq. on a sheet of wax paper. Brush the logs with the egg white and roll in the sugar, pressing to relieve it adhere. Nick the logs into 1/4-plug slices and switch to the baking sheets, about 1/2 plug apart. Bake the cookies for approximately 20 minutes, except appropriate firm to the contact; shift the sheets from high to bottom and front to support midway via for even baking. Switch the baking sheets to racks to chill.
Originate Ahead
The cookies could well maybe be saved in an airtight container for up to 2 weeks.
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