Cream butter and sugar. Add rest of ingredients, one at a time (except powdered sugar). Chill mixture for about 15 minutes. Shape into small (about 2 inches) crescents and bake at 375 for about 12-15 minutes (should just begin to turn brown). Remove from oven, and while slightly warm dust with powdered sugar. The cookie will be delicate until fully cooled so use caution when dusting or coating with sugar.