Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper.
In a medium bowl, mix together the peanut butter, sugar, and egg until smooth.
Scoop out tablespoons of dough and roll them into balls. Place them on the baking sheet about 2 inches apart.
Press each ball down with a fork in a crisscross pattern.
Bake for 10 to 12 minutes or until the edges are lightly golden.
Let them cool for a few minutes before transferring to a wire rack. Try not to eat them all at once!