Beat powdered sugar, egg yolks and salt in a large bowl until creamy.
In a separate bowl, beat egg whites until very stiff; fold into sugar mixture.
In another bowl combine flour, anise seed and baking powder. Fold into creamed mixture quickly but thoroughly.
Fill a pastry bag fitted with a plain nozzle with cookie dough. Pipe small rounds onto ungreased baking sheets. Let stand overnight to dry.
Preheat oven to 325° F and bake cookies 20 minutes or until set Cool on a wire rack.
Servings: 36 cookies