Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a medium bowl, whisk together almond flour, coconut flour, baking soda, cream of tartar, sea salt, and 0.5 teaspoon cinnamon.
In a large bowl or stand mixer, cream together the softened butter and 6 tablespoons coconut sugar until light and fluffy.
Beat in the egg and vanilla extract until fully incorporated.
Gradually mix the dry ingredients into the wet ingredients until a cohesive dough forms.
In a separate small bowl, combine the coating ingredients (2 tablespoons coconut sugar and 1.5 teaspoons cinnamon).
Scoop approximately 1.5 tablespoons of dough per cookie and roll into uniform balls.
Roll each ball in the cinnamon-sugar mixture until evenly coated.
Place balls on the prepared baking sheet 2 inches apart and flatten slightly with your palm as they will not spread much during baking.
Bake for 10 to 12 minutes until the edges are golden and the tops are slightly set.
Allow cookies to cool on the baking sheet for at least 10 minutes to firm up before transferring to a wire rack.