Preheat oven to 350°F. Line a baking sheet with parchment paper.

In a bowl, cream together butter, peanut butter, granulated sugar, and brown sugar until light and fluffy. Mix in egg and vanilla until fully combined.

In a separate bowl, whisk flour, baking soda, and salt. Gradually mix into wet ingredients until just combined.

Scoop tablespoon-sized dough balls, place on the baking sheet, and press with a fork to create a crisscross pattern.

Bake for 10-12 minutes until edges are golden. Cool for 5 minutes on the sheet, then transfer to a wire rack. Enjoy!