Cream together butter and sugar. Then add flour, vanilla and salt and mix until combined.
Turn out dough onto a floured surface, and roll out to desired thickness. ⅓" - ½” recommended (you can go as thin as ¼" but they may be delicate).
Cut out cookies with a 3" biscuit cutter and place on parchment paper-lined cookie sheet. Bake 14-16 mins until edges are golden.