Preheat the oven to 180°C (356°F).
Combine peanut butter and sugar in a bowl and mix well.
Add the egg and blend thoroughly.
Add flour and baking powder, mixing until just combined.
Shape the dough into rounds and place them on a baking tray.
Flatten the surface with a fork to create a pattern.
Bake in the oven at 180°C (356°F) for 10–12 minutes.
Let the finished cookies cool.