Combine ingredients in a crockpot, mixing until combined

Turn the crockpot onto high and let it cook until the cranberries are soft, about 2 hours

Remove the cinnamon stick and scoop the mixture into s food processor or blender and blend until pureed.

Using a strainer, push the cranberry through using a rubber spatula

Trash the solids from the cranberries

Place the butter back into the crockpot and turn it onto low

Allow the butter to thicken before removing - about an hour

Preheat oven to 350 degrees

Line two full sheet cookie sheet pans with parchment paper

Using a standing mixer, cream together the butter, powder sugar, vanilla and egg, and mix until combined and creamy

Using a large bowl, combine the flour, baking soda and cream of tarter

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 48 rounds and place a minimum of 12-15 cookies onto a cookie sheet

Bake for 8 minutes or until lightly golden brown

Repeat steps until completely out of dough

Let cookies cool completely

Pair up the cookies based on matching size and create 24 sandwich cookie shells

Using a large spoon, scoop some of the butter and place onto the bottom cookie

Place the top cookie onto the bottom cookie and sandwich together