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, mix together the creamy peanut butter, brown sugar, and granulated sugar until smooth.

Add the egg and vanilla extract to the peanut butter mixture and mix until fully incorporated.

Gradually add the dry ingredients to the wet mixture, stirring 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.

Bake in the preheated oven for 8-10 minutes, or until the edges are lightly golden. The centers should look soft.

Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.