01 - Preheat oven to 350°F. Line baking sheet with parchment paper.
02 - Whisk almond flour, coconut flour, erythritol, cinnamon, baking powder, and salt in large bowl.
03 - Whisk melted butter, egg, and vanilla extract in separate bowl until smooth.
04 - Add wet ingredients to dry ingredients. Stir until soft dough forms.
05 - Scoop tablespoon-sized portions, roll into balls. Place 2 inches apart on prepared sheet. Flatten gently with fingers or glass bottom.
06 - Mix topping erythritol and cinnamon in small bowl. Sprinkle evenly over each cookie.
07 - Bake 12–15 minutes until edges are golden and centers are set.
08 - Cool on baking sheet 10 minutes, then transfer to wire rack to cool completely.