Preheat the oven to 350ºF.
Grease a loaf pan and set aside.
In a large bowl, cream together the melted butter and brown sugar.
Mix in the eggs, oil, and vanilla extract until well combined.
Next, add in the cocoa powder, salt, and baking soda, stirring until well combined.
Using a paper towel, squeeze out any excess moisture from the zucchini and add it to the bowl, stirring until well combined.
Mix in the flour until well combined.
Fold in the chocolate chips.
Pour the batter into the loaf pan and bake from 50-60 minutes. Let cool before slicing and serving.