01 - Preheat the oven to 350°F. Line a baking sheet with parchment paper.
02 - In a large bowl, whisk together almond flour, erythritol, sea salt, baking powder, and instant espresso powder until thoroughly blended.
03 - In a separate bowl, whisk the melted butter, egg, and vanilla extract until smooth and well combined.
04 - Pour the wet ingredients into the dry ingredients and stir until a thick, uniform dough forms.
05 - Gently fold in chopped walnuts until evenly distributed throughout the dough.
06 - Scoop tablespoon-sized portions of dough onto the prepared baking sheet, spacing them 2 inches apart. Flatten each cookie slightly with your fingers.
07 - Bake for 10-12 minutes, or until the edges are golden brown.
08 - Allow cookies to cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.