Preheat oven to 350 degrees
Cover a cookie sheet with parchment paper and set aside
Using a standing mixer, cream together the butter, powder sugar, vanilla and egg and mix until combined and creamy
Using a large bowl, combined the flour, baking soda, and cream of tartar
Gradually add in the dry ingredients and mix on low speed
Using your hands continue to mix until fully combined
Lightly flour a cutting board and knead the cookie dough a couple of times
Roll out the dough to about 1/2 inch thick
Cut out 12 circles and place onto a cookie sheet
Bake for 8 minutes or until lightly golden brown
Repeat steps until completely out of dough
Let cookies cool completely