Add butter, eggs, brown sugar and vanilla extract, then mix them together.
Sift the flour, cornflour, baking powder, baking soda, and oil, then also mix them.
Add in the chocolate chips and mix it, then put it in the refrigerator for 30 minutes.
Brush the mould with butter, take the cooled chocolate chip mixture and separate it into small pieces.
Set the air fryer at 160 degrees for 15 minutes, when the cookies first come out they will be quite soft, after cools down it will be perfect in shape.