Shortbread

In mixing bowl, cream together butter, salt and both sugars. Gradually blend in flour and cornstarch which have been sifted together. Shape dough into a 15-in. x 2-in. x 1-in. rectangle; chill. Slice cookies 1/4 inch thick; place on ungreased baking sheet. Make two fork prints on each cookie. Bake at 325 degrees F for 15-18 minutes. Don't overbake-cookies will not brown. Cool on wire rack. ');