01 - Preheat oven to 350°F. Line a baking sheet with parchment paper.
02 - In a large bowl, whisk together the almond flour, erythritol, baking powder, and salt until evenly blended.
03 - In a separate bowl, beat the softened butter with the egg and vanilla extract using an electric mixer or whisk until smooth and creamy.
04 - Pour the wet mixture into the dry ingredients and mix thoroughly until a uniform dough forms.
05 - Gently fold the chopped walnuts into the dough, distributing them evenly throughout.
06 - Scoop tablespoon-sized portions of dough onto the prepared baking sheet, spacing them about 2 inches apart. Flatten each ball slightly with your fingers or the back of a fork.
07 - Bake for 12 to 15 minutes, or until the edges are golden brown.
08 - Allow the cookies to cool on the baking sheet for 5 minutes, then transfer to a wire cooling rack to cool completely.