Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

In a large bowl, combine peanut butter, erythritol, egg, vanilla extract, baking soda, and salt until a smooth, well-mixed dough forms.

Roll the dough into uniform 1-inch balls and arrange them on the prepared baking sheet.

Gently flatten each cookie dough ball with a fork, creating a classic crosshatch pattern.

Bake for 10-12 minutes, or until the edges are lightly golden. Let them cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.