Preheat oven to 400 degrees F. Line a baking sheet with parchment paper or a silpat.

Cream butter and 1 ½ cups sugar together in a stand mixer until smooth. Add in eggs and vanilla and mix well. 

In a separate bowl, combine flour, cream of tartar, baking soda, and salt. With the mixer running on low speed, slowly add the dry ingredients to the wet. Stir just to combine, scraping as needed.

Combine remaining sugar with the pumpkin pie spice in a plastic bag.

Use a medium cookie scoop and shape dough into balls. Drop each ball into the sugar spice mixture and then set on the baking sheet, 2 inches apart.

Bake 8 minutes in preheated oven. Allow to cool on sheet for 5 minutes before transferring to a cooling rack.

Store in airtight container.