Cream butter, shortening and sugar together then beat in eggs.
In a separate bowl mix the flour, cream of tartar, baking soda, and salt. Mix into the wet ingredients.
Roll dough into balls and roll in a cinnamon sugar mix. You can then bake them as cookies, or press them into a greased mini muffin tin to make snickerdoodle cups.
Bake at 375 degrees for 10 minutes.
Pie Filling
Mix pumpkin puree, pudding, and pumpkin pie spice together.