Preheat oven to 375°F and line baking sheets with parchment paper.
Beat butter and sugar together in mixer until fluffy.
Beat in egg and vanilla.
Sift in dry ingredients.
After thoroughly mixing the dough, knead to form a soft ball.
Wrap and chill the dough at least 30 minutes for easier handling.
Form the dough into 1 inch balls and roll in sanding sugar (I like the larger sizr crystals).
Place on baking sheet and bake until bottoms are lightly browned, 10-15 minutes.
Cool on parchment.
To keep cookies fresh, store in tins or freeze.