Preheat oven to 160C. Grease baking dish. Combine all ingredients except chocolate chip and grated zucchini.
The mixture will be crumb-like. Thats ok, as you can add the grated zucchini now- to add moisture. DONT discard the water from the zucchini. Mix well.
Now add the chocolate chips or diced chocolate buttons.
Spread the mixture on to a brownie baking dish.
Bake for 30-35 minutes or until cooked through. Cool and sift icing sugar over the top. Cut into squares.