In a food processor, pulse the almond flour, confectioners' sugar, semolina, cornstarch and salt. Add the butter and pulse until smooth. Add the egg white and pulse until incorporated. Add the corn nuts and pulse just until blended. Scrape the dough (it will be very soft) onto a sheet of plastic wrap and top with another sheet. Pat the dough into a rough 10-by-8-inch rectangle and transfer to a baking sheet. Freeze until very firm, 30 minutes.