01 - Heat oven to 350°F and line a baking sheet with parchment paper.
02 - Whisk almond flour, coconut flour, baking soda, and salt together in a medium bowl.
03 - Using an electric mixer or whisk, beat softened butter and powdered erythritol until light and fluffy.
04 - Add egg, vanilla extract, and maple extract to the creamed mixture; mix thoroughly.
05 - Gradually blend dry ingredients into the wet mixture until a soft dough forms.
06 - Fold in pecans or walnuts and sugar-free chocolate chips if desired.
07 - Scoop tablespoon-sized dough balls onto the prepared sheet, spacing 2 inches apart; flatten slightly.
08 - Bake 10 to 12 minutes until edges turn golden; let cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.