01 - Preheat oven to 350°F. Line a baking sheet with parchment paper and set aside.
02 - In a medium bowl, whisk together the almond flour, coconut flour, erythritol or monk fruit sweetener, baking powder, and salt until evenly distributed.
03 - In a large bowl, beat the softened butter with the egg, vanilla extract, and maple extract using an electric mixer or whisk until smooth and creamy.
04 - Gradually add the dry ingredient mixture to the wet ingredients, mixing gently until fully combined and no dry pockets remain.
05 - Fold the chopped walnuts into the dough, distributing evenly throughout.
06 - Use a cookie scoop or tablespoon to drop dough portions onto the prepared baking sheet, spacing about 2 inches apart. Flatten each portion slightly with your fingers or the back of a fork.
07 - Bake for 13 to 15 minutes, or until the edges are golden brown and set.
08 - Let cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely. The cookies will crisp as they cool.