Preheat your oven to 180 degrees celsius (fan-forced) and line 2 x muffin trays with 18 paper cases.
Place the zucchini into your Thermomix bowl and mix for 6 seconds, speed 6 to grate.
Scrape down the sides of your Thermomix bowl and add the greek yoghurt, coconut oil, eggs, maple syrup and vanilla extract. Mix for 10 seconds, speed 4.
Scrape down the sides of your Thermomix bowl and add the self raising flour and cacao. Mix for 12 seconds, speed 4 to combine.
Add 100 grams of the chocolate chips and use your spatula to stir them through.
Divide the mixture between the paper cases and sprinkle with the remaining chocolate chips.
Place the muffin trays into your preheated oven and bake for 15 - 18 minutes or until cooked through when tested with a skewer.