Cream butter and sugar, then egg, then vanilla. In a separate bowl, sift together dry ingredients. Add alternately to creamed mixture, buttermilk and sifted ingredients. When finished mixing, cover with plastic wrap. Refrigerate for 8 hours.
Preheat oven to 350 degrees. Portion dough into 12 roughly equal portions,, and turn dough into figure eights, handling as little as possible. Bake 10-15 minutes on greased cookie sheet until they just start to brown. Butter and eat.