Preheat the oven to 180°C (356°F).
Mix the butter and sugar until smooth.
Add the egg and mix well.
Sift in flour and baking powder.
Combine all ingredients into a single dough.
Add chocolate chips and mix into the dough.
Shape the dough into balls and place on a baking pan.
Bake in the oven for 12 to 15 minutes.