1. In a large bowl, cream together the peanut butter, softened butter, brown sugar, and granulated sugar until light and fluffy.

2. Add the egg and vanilla extract. Mix until well combined.

3. In a separate bowl, whisk together the flour, baking soda, and salt.

4. Gradually stir the dry ingredients into the wet mixture until just combined. Do not overmix.

5. Use a cookie scoop to form dough balls and place them on a parchment-lined baking sheet.

6. Flatten each ball with a fork in a crisscross pattern.

7. Bake at 350°F (175°C) for 9–11 minutes, until edges are set and centers look slightly underdone.

8. Let cookies cool on the sheet for 5 minutes before transferring to a wire rack.