01 - Preheat the oven to 350°F. Line a baking sheet with parchment paper.
02 - Whisk together almond flour, coconut flour, baking powder, and salt in a medium bowl until evenly distributed.
03 - Beat softened butter with powdered erythritol in a large bowl until light and fluffy, approximately 2 minutes.
04 - Add egg and vanilla extract to butter mixture. Beat until fully incorporated and smooth.
05 - Gradually fold dry ingredients into wet mixture until soft dough forms. Do not overmix.
06 - Using a tablespoon or cookie scoop, portion dough into 18 rounds. Place on prepared baking sheet, spacing 2 inches apart.
07 - Lightly flatten each cookie with fingertips or back of a spoon to desired thickness.
08 - Bake for 12 to 15 minutes until edges are just turning golden brown.
09 - Let cookies cool on baking sheet for 5 minutes, then transfer to wire rack to cool completely.
10 - Dust with extra powdered erythritol and garnish with keto-friendly edible sprinkles if desired.