01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the almond flour, coconut flour, baking powder, and fine sea salt until evenly blended.
03 - In a large bowl, beat the softened butter and erythritol together using an electric mixer or whisk until light and fluffy.
04 - Beat in the egg and pure vanilla extract until the mixture is smooth and well combined.
05 - Gradually add the dry ingredient mixture to the wet ingredients, mixing until a soft, cohesive dough forms.
06 - Gently fold the toasted, chopped pecans into the dough until evenly distributed throughout.
07 - Scoop tablespoon-sized portions of dough onto the prepared baking sheets, spacing about 2 inches apart. Gently flatten each portion with your fingers or the back of a spoon.
08 - Bake for 16 to 18 minutes, or until the edges are golden and the centers are set.
09 - Let the cookies cool on the baking sheets for 10 minutes, then transfer to a wire rack to cool completely for maximum crunch.