01 - Preheat the oven to 350°F. Line a baking sheet with parchment paper.
02 - In a medium bowl, whisk together the almond flour, coconut flour, baking powder, and salt until evenly distributed.
03 - In a large bowl, beat the softened butter and granulated erythritol with a hand mixer until light and fluffy, approximately 2 minutes.
04 - Beat in the egg, vanilla extract, and maple extract into the creamed mixture until fully combined and smooth.
05 - Gradually add the dry ingredient mixture to the wet ingredients, mixing on low speed until a soft, cohesive dough forms.
06 - Gently fold the toasted chopped walnuts into the dough using a spatula, ensuring even distribution throughout.
07 - Scoop tablespoon-sized portions of dough onto the prepared baking sheet, spacing them about 2 inches apart. Flatten each ball lightly with your fingers or the tines of a fork.
08 - Bake for 12 to 15 minutes, or until the edges are golden brown and the centers are just set.
09 - Allow the cookies to rest on the baking sheet for 10 minutes, then transfer to a wire rack to cool completely before serving.