Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper or a silicone baking mat.

In a medium mixing bowl, combine the peanut butter, sugar, and egg. Stir until the mixture is well combined and forms a dough.

Using a tablespoon or cookie scoop, portion the dough into 1-inch balls and place them on the prepared baking sheet, about 2 inches apart.

Press down gently on each ball with the back of a fork to create a crisscross pattern on the top of each cookie.

Bake the cookies in the preheated oven for 10-12 minutes, or until the edges are set and the tops look slightly crackled.

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