01 - Preheat oven to 350°F. Line baking sheet with parchment paper.
02 - Whisk almond flour, coconut flour, powdered sweetener, baking powder, sea salt, and espresso powder in medium bowl until uniform.
03 - Beat softened butter until creamy. Add egg and vanilla extract, mixing until fully incorporated.
04 - Gradually add dry ingredients to wet mixture, mixing until soft dough forms.
05 - Scoop tablespoon portions, roll into balls, place on baking sheet, flatten slightly with palm or glass bottom.
06 - Bake 12-15 minutes until edges are lightly golden.
07 - Cool completely on baking sheet before transferring to wire rack.