01 - Preheat the oven to 350°F and line a baking sheet with parchment paper.
02 - In a large bowl, cream together the softened butter and granulated erythritol until light and fluffy, about 2 minutes.
03 - Beat in the egg and vanilla extract until fully combined and the mixture is smooth.
04 - Stir in the almond flour and salt, mixing until a soft dough forms and no dry pockets remain.
05 - Gently fold the chopped toasted walnuts into the dough until evenly distributed.
06 - Scoop tablespoon-sized portions of dough onto the prepared baking sheet, spacing them about 2 inches apart. Flatten each mound slightly with your fingers.
07 - Bake for 12 to 15 minutes or until the edges are golden brown. Allow cookies to cool completely on the baking sheet before drizzling.
08 - In a small bowl, whisk together the walnut butter, powdered erythritol, vanilla extract, and 1 teaspoon almond milk. Add more almond milk a few drops at a time until a smooth, pourable consistency is reached.
09 - Once cookies are completely cool, drizzle the walnut butter mixture over them using a spoon or piping bag. Let the drizzle set for 10 minutes before serving.