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

In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.

In a large mixing bowl, use an electric mixer to cream together the peanut butter, softened butter, brown sugar, and granulated sugar until smooth.

Beat in the egg and vanilla extract until well combined.

Gradually add the dry ingredients to the wet mixture, mixing until just combined.

Using a tablespoon, scoop out dough and roll into balls. Place them on the prepared baking sheet, spacing them about 2 inches apart.

Use a fork to gently flatten each cookie and create a crisscross pattern on top.

Bake in the preheated oven for 8-10 minutes, or until the edges are lightly golden.

Remove from the oven and let the cookies cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.