Beat Egg Whites Stiff. Slowly Add 1/3 Cup Powdered Sugar. Fold In Vanilla And Egg Yolks. Sift Together The Flour, Salt And 1/3 Cup Powdered Sugar. Carefully Fold In The Beaten Egg Mixture. Press Into Finger Length Shapes. Dust With Powdered Sugar. Bake In 350 Degree Oven For 10 Minutes.