In a large bowl, beat powdered sugar, butter, egg, and vanilla.

Sift together flour, baking soda, cream of tartar and salt. Add to butter mixture and stir until blended.

Refrigerate dough 1 hour or until firm.

Shape dough into one-inch balls and place 2 inches apart on cookie sheets. Flatten with cookie press. Roll them in a generous amount of Spiced Vanilla Sugar.

Bake at 350 F for 5-8 minutes, until set, being careful not to overbake.