Sift flour, add creamed butter and mix with the powdered sugar. Fold in the ground nuts and vanilla.
Roll small quantities of dough between the palms of your hands into crescent shapes.
Place on greased cookie sheets and bake 20 to 25 minutes in a preheated 350° oven. Remove from cookie sheets and roll in powdered sugar while still warm. Yields about 80 cookies, depending, of course, on the size of the crescents.