01 - Preheat the oven to 350°F and line a baking sheet with parchment paper.
02 - In a medium bowl, whisk together the almond flour, coconut flour, powdered erythritol, baking powder, and fine sea salt until evenly distributed.
03 - In a large bowl, beat the softened butter until creamy using an electric mixer. Add the egg and pure vanilla extract, mixing until well combined and smooth.
04 - Gradually add the dry ingredient mixture to the wet ingredients, mixing on low speed until a cohesive dough forms.
05 - Gently fold the chopped toasted pecans into the dough until evenly distributed throughout.
06 - Scoop tablespoon-sized portions of dough, roll into balls, and place on the prepared baking sheet spaced 2 inches apart.
07 - Gently flatten each dough ball with the palm of your hand or the bottom of a glass to about 1/3 inch thickness.
08 - Bake for 12 to 15 minutes until the edges are golden and the centers are just set.
09 - Allow the cookies to cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely before serving.