In a small bowl, cream butter and sugar. Add egg and vanilla; mix well. Combine the flour, baking powder and pumpkin pie spice; gradually add to the creamed mixture.
Using a cookie press fitted with the disk of your choice, press dough 2 in. apart onto ungreased baking sheets. Sprinkle with colored sugar. Bake at 375° for 8-10 minutes or until edges begin to brown. Remove to wire racks to cool.