Preheat the oven to 180°C (356°F).
Combine peanut butter, sugar, and egg in a bowl and mix well.
Scoop the dough one spoonful at a time and shape into balls.
Place the dough balls on a baking sheet and press them down with a fork to create a pattern.
Bake in the oven at 180°C for 10 to 12 minutes.