Preheat oven to 375°.
In a small bowl, make the sugar dusting by combining the pumpkin pie spice and sugar. Set it aside until needed.
Sift together, flour, cream of tartar, baking soda, pumpkin pie spice, and salt.
With a stand mixer or hand mixer, mix butter, sugar, and eggs for 3 minutes until they are fluffy.
Add the dry ingredients 1/3 cup at a time and mix until fully incorporated.
Cover dough and chill it for 1-2 hours or overnight.
Roll chilled dough into walnut-sized balls.
Roll cookie dough balls in the sugar pumpkin dusting.
Place the cookies on a parchment paper-lined cookie sheet.
Bake for 13 minutes.