Preheat oven 180ºC on a fan forced setting and line a rectangular baking tin with paper.
Place butter, honey and cacao in Thermomix bowl and cook for 3 min/100ºC/speed 2.
Add granola and blend for 5 sec/Reverse/speed 3-4.
Press into prepared pan using MC to smooth the surface. Bake for 25 minutes.
Meanwhile, melt the chocolate with the coconut oil either on Induction 3-4 or chop in Thermomix bowl, then melt for 5-6 min/37º/speed 2.
Drizzle or flick (or absolutely ladle) over surface of cooked Muesli Bars and set until cold.
Cut into lengths and don't eat them all at once!