Combine oatmeal and flour in a bowl and mix.
Add cocoa powder and baking powder.
Melt the butter and mix with sugar.
Add the egg and mix well.
Pour the butter mixture into the oatmeal mixture and mix evenly.
Add chocolate chips and mix again.
Shape the dough into balls and place on a baking tray.
Bake at 180°C for 12–15 minutes.