Preheat oven to 350. Line a large cookie sheet with parchment paper.
Pulse the walnuts in a food processor until they are finely chopped. Add the butter, almond flour, coconut flour, sweetener, gelatin, maple extract, and cinnamon. Pulse until wet crumbs form.
Divide the dough into 16 pieces. Roll each piece into a ball. Put on the prepared baking sheet and press down gently.
Bake for 18-22 minutes or until the edges are golden. Cool completely.
Stir together the ingredients for the glaze. Brush it on top of the cookies with a pastry brush. Put the cookies in the refrigerator to chill. The glaze will harden in the refrigerator so you can stack the cookies.