Preheat your oven to 400°F on the Bake setting.
Start by grating your zucchinis. Press the shredded zucchini manually over the sink to remove some of the excess fluid. If using small/medium zucchinis, to do not fully remove all the fluid to avoid dry muffins.
Mix your dry ingredients together in a bowl (flour, cocoa powder, baking soda, salt).
Whisk all your wet ingredients together in a separate bowl (sugar, eggs, slightly/cooled espresso coffee, vanilla essence) .
Then mix your dry ingredients into the wet ingredients bowl. Combine together but do not over mix.
Gently mix in the shredded zucchini.
Add 3/4 cup chocolate chips to the batter.
Fill each muffin cup 3/4 of the way.
Sprinkle the remaining 1/4 cup of chocolate chips on the tops of the muffin cups and pop into the oven.