Cream butter in mixer until smooth.
Add confectioners' sugar and beat until light and fluffy.
Mix flour and salt and add, combining thoroughly.
Roll with rolling pin ¼ inch thick, cut (they suggest 1x2 rectangles; I rather prefer flowers or animals or something), place on ungreased baking sheet and prick with fork.
Makes about 24 cookies.
Bake at 350℉ (180℃) for 20 to 25 minutes or until lightly browned around the edges.
Cool on rack. (Can also dust with a little sugar before baking).