Preheat oven to 170C and grease a mini muffin baking tray.
In a bowl whisk together rice bran oil and sugar for 2-3 mins until the sugar begins to dissolve.
Then whisk in eggs and vanilla. Use a wooden spoon to carefully fold in sifted plain flour, baking powder, bicarb, cacao a little at a time, alternating with milk.
The finally fold in grated zucchini and . of the chocolate chips. Spoon into the mini muffin tray, filling each whole . way and top with remaining chocolate chips.
Bake for 20mins or until cooked through.