Preheat oven to 180C.
Grease a lamington tray with baking paper.
In a large bowl, combine the oil, sugar and vanilla and mix well.
Combine the flour, cocoa, baking soda and salt and slowly mix into the sugar/oil mix.
Fold in the zucchini and chocolate chips.
Spread evenly into prepared tray.
Bake for 25-30 minutes until the brownies spring back with gently touched.