01 - Preheat the oven to 350°F. Line a baking sheet with parchment paper.
02 - In a large bowl, whisk together the almond flour, coconut flour, erythritol, baking powder, and salt until evenly distributed.
03 - In a separate bowl, whisk together the melted butter, egg, maple extract, and vanilla extract until smooth and well blended.
04 - Pour the wet mixture into the dry ingredients and stir until a uniform dough forms with no dry spots remaining.
05 - Gently fold the toasted chopped walnuts into the dough, distributing them evenly throughout.
06 - Scoop tablespoon-sized portions of dough onto the prepared baking sheet, spacing them 2 inches apart. Flatten each ball gently with your fingers or the back of a spoon.
07 - Bake for 13 to 15 minutes, or until the edges are golden brown and the cookies are set.
08 - Let the cookies cool on the baking sheet for 10 minutes, then transfer to a wire rack to cool completely before serving.