Potato Chip Cookies

3/4 c butter or margarine )---cream together.
3/4 c white sugar         )                     Drop by spoonsful
1 egg yolk ------------------)                  onto cookie sheet.
3/4 c crushed potato chips   )--Add.            Flatten with fork
1½ c flour ------------------)                  dipped in water.
                                      Bake at 350° for 10 minutes.