confectioners' sugar, sifted
all purpose flour
set aside extra sifted confectioner's sugar in a bowl for after baking
In mixing bowl cream together butter & 1/2 cup of confectioner's sugar.
Add egg yolk, cognac & vanilla. Mix well.
Mix together flour & baking powder, blend into sugar mixture with electric mixer.
Work dough, using a little extra flour, so the dough will not stick to your fingers. Form dough into small balls & form into an "s" shape.
Place "s" shaped cookies on to an ungreased cookie sheet, bake at 350 until a light sand color begins to show. Should be 10-12 minutes.
As you remove cookies from cookie sheet, while still hot roll into extra confectioner's sugar.