01 - Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
02 - In a large mixing bowl, blend together almond flour, hazelnut meal, sweetener, sea salt, and baking powder until evenly incorporated.
03 - In a separate bowl, whisk melted, cooled unsalted butter, large egg, and pure vanilla extract until fully combined and smooth.
04 - Gradually pour the wet mixture into the dry ingredients, stirring just until a soft, cohesive dough is achieved.
05 - Fold in half of the chopped hazelnuts, reserving the remainder for topping.
06 - Scoop tablespoon-sized portions of dough onto the prepared baking sheet, spacing each about 2 inches apart.
07 - Gently flatten each mound and sprinkle with the reserved chopped hazelnuts, pressing lightly to adhere.
08 - Bake in the preheated oven for 12–15 minutes, or until the edges turn golden and the centers are set.
09 - Allow cookies to cool completely on the baking sheet before transferring to a wire rack to maintain structure.