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

In a bowl, combine peanut butter, sugar, and egg. Mix well until smooth.

Using a spoon, scoop out dough and roll into balls. Place them on the prepared baking sheet.

Flatten each ball with a fork, making a crisscross pattern.

Bake for 10 minutes, or until golden brown.

Remove from oven and let cool for a few minutes before transferring to a wire rack.