In a large mixing bowl, combine peanut butter, granulated sugar, brown sugar, and egg. Mix until smooth and creamy, about 2-3 minutes.

Gradually add flour, baking soda, and salt, mixing until fully combined.

Refrigerate the dough for at least 30 minutes or up to 24 hours for optimal results.

Preheat your oven to 350°F (175°C). Shape tablespoon-sized portions of dough into balls.

Place dough balls on a baking sheet lined with parchment paper, spacing each about 2 inches apart.

Using a fork, gently press down on each ball to create a criss-cross pattern.

Bake in the preheated oven for 10 to 13 minutes, until edges are lightly golden.

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