For about 15 big muffins you will need;

180g plain yoghurt
180g greek yoghurt

160g white sugar
80g brown sugar
320g eggs
120g trimoline (or glucose)
4g salt
440g flour
80g cacao powder
24g baking powder
220g oil
100g chocolate (+ more for topping)

How to:
Mix both yoghurts with the sugars, eggs and trimoline. Add the dry ingredients such as salt, flour, cacao powder and baking powder and mix. Add the oil till the mixture is incorporated. Lastly add the chopped up chocolate. Fill your muffin molds and add extra chocolate on top. Bake at 170C for about 25 min, when you insert a toothpick it comes out clean.