2 cups hazelnuts, toasted and skinned
1 1/4 cup sugar
4 large egg whites
1/2 teaspoon salt
1 teaspoon vanilla extract
Position 2 racks as close to the center of the oven as possible;
preheat to 325°F.
Line 2 baking sheets with parchment paper.
Pulse nuts and sugar in a food processor until finely ground.
Scrape into a large bowl.
Beat egg whites and salt in another large bowl with an electric mixer on high speed until stiff peaks form.
Using a rubber spatula, gently fold the egg whites into the nut mixture.
Add vanilla and gently but thoroughly mix until combined.
Drop the batter by the tablespoonful 2 inches apart on the prepared baking sheets.
Bake the cookies until golden brown, switching the pans back to front and top to bottom halfway through, 25 to 30 minutes.
Let cool on the baking sheets for 5 minutes.
Gently transfer the cookies to a wire rack to cool completely.