Brown Sugar Shortbread Puffs

Directions

1. 1
   Beat brown sugar and butter until light and fluffy.
2. 2
   Add vanilla and egg yolk; mix well.
3. 3
   Add flour, stir until mixture forms a smooth dough.
4. 4
   Drop dough by rounded teaspoonfuls 2 inches apart onto an ungreased cookie sheet.
5. 5
   Bake at 350° for 10 to 15 minutes or until lightly browned and set.