Preheat your oven to 350°F.
Whisk together the flour, baking soda, salt, cream of tartar, and cinnamon. Set this aside.
In the mixer, beat together the sugar and butter until fluffy.
Add the vanilla and eggs, at beat until smooth.
Add in the dry ingredients bit by bit, until it just starts to come together.
Take the frozen filling crumbles and work them into the dough. It's easiest done by hand, just kneading it together. Work fast, so you don't heat up the filling and melt it with your hands.
Use a spoon or cookie scoop to dole out 1 tbsp balls of dough. Optional: roll these in cinnamon-sugar.
Bake the cookies for about 11 minutes. They'll look a bit under-done, but will finish cooking as they cool.
Let the cookies cool for a few minutes, then move them to a cooling rack to finish cooling.