Preheat the oven to 170℃ and line a 9 inch loaf tin with baking paper, set aside.
In a large plate, shred the zucchini and press out some of the excess liquid. Set aside.
In a large mixing bowl add the vegetable oil, brown sugar, castor sugar and whisk until smooth.
Add the oil, vanilla, eggs and whisk until combined. Add the zucchini and whisk again.
Add the flour, corn flour, cocoa powder, baking powder, baking soda, salt and chocolate chips. Whisk until there are dry pockets of ingredients and the batter is combined.
Pour into the prepared baking tin and you can pipe a line of softened butter on top in the middle to give it that bakery style crack on top once baked.
Bake for 50-55 minutes or until a tooth pick inserted into the center comes out with moist/sticky crumbs and the top is risen and dry to the touch.
Allow it to cool in the tin completely before slicing and serving.