Preheat the oven to 350°F/175°C
Sift the flour, the cocoa powder, the baking soda, the cinnamon and the salt into a bowl and mix well [Dry ingredients]
In another bowl whisk the sugar, the egg and the egg yolk until creamy [Liquid ingredients]
Add the melted butter and vanilla extract to the bowl with the liquid ingredients and mix in well. Mix the zucchini in well
Gradually add the dry ingredients to the liquid ingredients and mix in well.
Add the chocolate chips to the mix and stir in with a spoon or a fork
Butter a cake pan and add a tbsp of cocoa powder. Shake the cocoa powder around the cake pan until its fully covered
Pour the dough into the cake pan and bake it for 50min
After the cake is baked let it cool for 10min on the counter. Then take it out of the form and sprinkle flaky sea salt on the cake
