01 - Preheat oven to 350°F. Line a baking sheet with parchment paper.
02 - Whisk together almond flour, hazelnut meal, baking powder, and salt in a medium bowl until evenly blended.
03 - Beat softened butter, hazelnut butter, and sweetener in a large bowl until creamy and light in texture.
04 - Mix in egg, vanilla extract, and maple extract until fully incorporated into the wet mixture.
05 - Gradually fold dry ingredients into wet mixture, mixing until a soft, cohesive dough forms.
06 - Scoop tablespoon-sized portions, roll into balls, and place on prepared baking sheet 2 inches apart.
07 - Flatten each ball with a fork in a crisscross pattern. Press chopped hazelnuts into tops if using.
08 - Bake for 11 to 13 minutes until edges are golden brown and centers are set.
09 - Let cookies rest on baking sheet for 5 minutes, then transfer to wire rack to finish cooling.