1. Preheat your oven to 175°C and line a baking sheet with parchment paper.

2. In a mixing bowl, combine the peanut butter, erythritol, egg, vanilla extract, baking powder, and salt. Mix well until all the ingredients are fully incorporated.

3. Roll the dough into small balls, about cm in diameter, and place them on the prepared baking sheet. Leave some space between each cookie as they will spread slightly while baking.

4. Use a fork to create a crisscross pattern on top of each cookie, gently pressing down to flatten them slightly.

5. Bake the cookies in the preheated oven for about 10-12 minutes, or until they are golden brown around the edges.

6. Remove the baking sheet from the oven and let the cookies cool for a few minutes before transferring them to a wire rack to cool completely.

7. Once cooled, store the Keto Peanut Butter Cookies in an airtight container at room temperature for up to one week.

Enjoy your delicious and keto-friendly Peanut Butter Cookies!