Preheat the oven to 350°F
Oil the loaf pan
Grate enough zucchini for 2 cups of grated zucchini
Squeeze out the water from the zucchini with a tea towel or paper towel
Mix the dry ingredients (flour, cacao powder, cinnamon, corn starch, baking soda, baking powder, brown sugar) in a bowl and mix everything well with a whisk
In a separate bowl mix the wet ingredients (vanilla essence, milk, apple cider vinegar and oil) and zucchini
Combine the wet and dry ingredients
Pour in the loaf pan
Bake in the oven for 1 hour or till a toothpick poked into the loaf comes out clean
Let it rest till it completely cools. THIS IS VERY IMPORTANT. If you cut it too early, the gluten cannot set and the loaf will flatten. Plus when you slice into the loaf it will be very crumbly so let it rest for at least an hour