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

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

In a large mixing bowl, cream the butter, brown sugar, and granulated sugar until light and fluffy.

Add the peanut butter, egg, and vanilla, mixing until fully combined.

Fold the dry ingredients into the wet ingredients until just combined.

Scoop and roll the dough into balls and place them on the prepared baking sheets.

Using a fork, create crisscross patterns on top of each cookie.

Bake for 10-12 minutes until the edges are golden. Cool for 5 minutes before transferring to a wire rack.