Preheat oven to 375°F

Combine flour, baking powder and baking soda in a small bowl and set aside

In larger bowl cream sugar and butter untill smooth

Beat in egg and vanilla

Gradually add dry ingredients until dough forms

Roll rounded teaspoons of dough into balls and place on an ungreased cookie sheet, 3×4 cookies per sheet

Flatten balls a little and brush on buttermilk and sprinkle on coloured sugar or sprinkles

Bake for 8-10 mins or until slightly browned

Let stand for 2 minutes before removing to cool on a rack