Preheat the oven to 350°F (180°C, or gas mark 4)
In a blender, combine all the ingredients except the shredded zucchini and optional chocolate chips.
Blend well until combined and then pour the batter into a mixing bowl. The batter will thicken slightly over the next few minutes.
Fold in the shredded zucchini and chocolate chips (if using) and stir well.
Pour the mixture into a greased loaf pan (glass preferred) and bake for about an hour, or until a toothpick inserted into the center comes out clean.
Let cool, then gently pry it away from the sides of the pan and invert onto a plate. Invert again.
Slice and serve warm.