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, combine the peanut butter, brown sugar, egg, and vanilla extract. Mix until smooth.

Gradually add the dry ingredients to the wet ingredients, 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.

Bake in the preheated oven for 10-12 minutes, or until the edges are lightly golden.

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