Combine oatmeal and flour in a bowl and mix together.
Add sugar, salt, and baking powder, then mix well.
Melt the butter, add it to the bowl, and mix.
Add the egg and finish making the dough.
Add the chocolate chips and mix evenly.
Form the dough into equal portions and place on a baking tray.
Bake in a preheated oven at 170°C for 12–15 minutes.
Cool on a wire rack.