01 - Preheat the oven to 350°F and line a baking sheet with parchment paper.
02 - Whisk together almond flour, cocoa powder, espresso powder, baking powder, and salt in a medium bowl until thoroughly blended.
03 - Beat the softened butter and erythritol in a large bowl until light and fluffy, approximately 2 minutes.
04 - Mix the egg and vanilla extract into the butter mixture until fully incorporated.
05 - Gradually add the dry ingredients to the wet mixture, stirring until a soft, pliable dough forms.
06 - Fold in the chopped hazelnuts and sugar-free chocolate chips until evenly distributed throughout the dough.
07 - Scoop tablespoon-sized portions of dough onto the prepared baking sheet, spacing them approximately 2 inches apart to allow for spreading.
08 - Gently press each dough ball with your fingers or the back of a spoon to achieve a flattened cookie shape.
09 - Bake for 11-13 minutes, until the edges are set while centers remain slightly soft for optimal texture.
10 - Let cookies rest on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.