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2 1/4 cups confectioners' sugar
1/4 teaspoon salt
1 teaspoon espresso powder, optional but good
1 cup cocoa powder, dutch-process (european-style) preferred
3 large egg whites (i had to add an extra because my batter was too thick)
2 teaspoons vanilla extract
preheat the oven to 350°F. lightly grease two baking sheets. or line with parchment, and grease the parchment (or use a silpat but if you do, make sure to cool the cookies completely before trying to remove them). stir together all of the ingredients till smooth. scrape the bottom and sides of the bowl, and stir again till smooth. drop the dough onto the prepared baking sheets in balls about the size of ping pong balls, about 1 1/2"; a tablespoon cookie scoop works well here. bake the cookies for 8 minutes; they should spread, become somewhat shiny, and develop faintly crackly tops (they get more crackly when you remove them from the oven, so don't wait for them to be perfectly crackly while in the oven). remove the cookies from the oven, and allow them to cool right on the pan.
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