Preheat oven to 350F and line cookie sheet with parchment paper.
In a mixing bowl whisk together almond and coconut flours, cinnamon, cream of tartar, baking soda, xanthan gum
In a separate bowl, using a mixer, cream together the butter, sugar substitute, vanilla extract, and eggs. Once well mixed, start slowly mixing in the dry ingredients.
For coating, mix together the cinnamon and sugar substitute. Roll the individual cookies into 1-1 ¼" balls.
Flatten balls slightly on a cookie sheet and bake for 10- 12 minutes.