01 - Preheat oven to 350°F. Line baking sheet with parchment paper.
02 - Whisk almond flour, cocoa powder, baking soda, and salt in medium bowl until blended.
03 - Beat melted butter and erythritol in large bowl until combined. Whisk in egg and vanilla extract until smooth.
04 - Gradually stir dry ingredients into wet mixture until thick dough forms.
05 - Drop tablespoon-sized dough onto prepared sheet, spacing 2 inches apart. Flatten slightly with spoon back.
06 - Warm almond butter if needed. Drizzle 1 teaspoon over each cookie. Swirl into tops with toothpick or knife.
07 - Bake 10 to 12 minutes until edges set and centers slightly soft.
08 - Rest on baking sheet 5 minutes. Transfer to wire rack to cool completely.