Preheat oven to 180°C (350°F) and line a baking sheet with parchment paper.

Cream butter, sugar, and brown sugar until light and fluffy.

Add peanut butter, egg, and vanilla extract and mix until smooth.

In another bowl, combine flour, baking soda, and salt.

Gradually mix dry ingredients into the wet mixture.

Roll dough into balls and place on the baking sheet.

Press each cookie with a fork to create a crisscross pattern.

Bake for 10–12 minutes until lightly golden.

Let cool before serving.