01 - Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper.
02 - In a mixing bowl, cream together the softened butter and granulated erythritol until light and fluffy.
03 - Beat in the egg, vanilla extract, and maple extract until well combined.
04 - Add the almond flour, baking powder, and salt. Stir until a soft dough forms.
05 - Fold the chopped 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 cookie slightly with the back of a spoon.
07 - Bake for 10–12 minutes, or until the edges are golden. Remove from oven and let cool completely on the baking sheet.
08 - In a small saucepan over low heat, melt the butter. Whisk in the powdered erythritol and maple extract until smooth. Remove from heat.
09 - Drizzle the maple walnut butter mixture over the cooled cookies. Sprinkle with extra chopped walnuts if desired. Allow the drizzle to set before serving.