01 - Preheat oven to 350°F. Line a baking sheet with parchment paper.
02 - In a medium bowl, mix peanut butter, egg, and vanilla extract until the mixture is smooth and fully combined.
03 - In a separate small bowl, whisk together erythritol, baking powder, and salt.
04 - Add the dry ingredient blend to the wet mixture and stir until you achieve a thick, cohesive dough.
05 - Scoop tablespoon-sized portions of dough, roll into balls, and set on the prepared baking sheet with a 2-inch gap between each.
06 - Gently flatten each ball with a fork, imprinting a crisscross design.
07 - Bake for 10 to 12 minutes until edges are set and lightly golden.
08 - Allow cookies to cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely before serving.