Step 1

For the cookies: In a food processor, grind the pistachios until fine. Add 2 3⁄4 cups of the confectioners’ sugar and the cinnamon. Continue pulsing to make a fine powder. Add the egg whites and process until the dough comes together.

Step 2

Preheat the oven to 300 ̊. Line 2 baking sheets with parchment paper.

Step 3

Bake the cookies for 15 to 17 minutes, or until the edges of the meringue barely start to color. Let cool 5 minutes on the baking sheets, then transfer to a rack to cool completely.