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

In a mixing bowl, whisk together the flour, baking soda, and salt until well combined.

In another bowl, beat together the peanut butter, granulated sugar, brown sugar, egg, and vanilla extract until smooth.

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

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

Use a fork to flatten each cookie, making a crisscross pattern on top.

Bake in the preheated oven for 10-12 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 them to a wire rack to cool completely.