01 - Set the oven temperature to 350°F and line a baking sheet with parchment paper.
02 - Whisk together almond flour, coconut flour, baking powder, and salt in a medium bowl.
03 - In a separate large bowl, blend melted butter with brown sugar substitute until smooth, then whisk in the egg and vanilla extract.
04 - Gradually incorporate dry ingredients into the wet mixture, stirring until a soft dough forms.
05 - Scoop heaping tablespoons of dough and roll into balls, then arrange them on the prepared baking sheet, spacing about 2 inches apart.
06 - Gently press each dough ball flat using fingers or the bottom of a glass.
07 - Bake for 10 to 12 minutes until edges turn lightly golden.
08 - Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.
09 - Once cooled, generously dust the cookie tops with powdered erythritol to create a snowy appearance.