1. Cream the butter and sugar. Add the flour and cornstarch and blend until smooth. Knead the dough for 10 minutes.
2. Roll out the dough into a rectangular shape, about 1/4 to 1/2 inch thick. Cut into desired shape (small triangles or rectangles). Score all cookies with a fork.
3. Bake at 350F degrees for 12 minutes, then 300 degrees for 12 minutes or until they are very slightly golden. Watch that they don't get too brown.