Preheat the oven to 180°C (356°F).
In a bowl, mix peanut butter and sugar together.
Add the egg and blend well.
Sift in flour and baking powder, then knead the dough.
Shape the dough into balls and place them on a baking pan.
Create designs on the cookies with a fork.
Bake in the oven for 10-12 minutes.
Let cool on a wire rack.