Preheat the oven to 180°C. Prepare a bread pan or 2 smaller bread pans with baking paper.
Peel zucchini and grate them finely on the cheese grater. Press the zucchini to release some of the moisture.
Whisk butter, oil and vanilla extract with sugars. After 4 minutes of whisking add eggs and whisk for another 5 minutes.
Add flour, baking powder, cocoa powder, and salt. At this point use a wooden spoon to work with a very thick mixture. Just stir until the flour disappears. When the mixture is well stirred, add grated zucchini and stir again. After a few minutes, the mixture starts to release some moisture so it becomes less thick and will be runnier. Add chopped chocolate and stir well.
Pour the mixture into the bread pan. Sprinkle some almond flakes over the loaves of bread. Bake for 45-60 minutes. I baked mine in 2 small bread pans for 50 minutes.
Take the bread out of the oven and let cool completely. When the bread is cool, pour some cool melted white chocolate over it. Enjoy!