Preheat oven 180ºC on a fan forced setting and line a rectangular baking tin with paper.
Place butter, honey and cocoa into the 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 8 min/40°C/speed 2. Stop and scrape down sides of bowl as needed.
Drizzle or flick (or absolutely ladle) over surface of cooked Muesli Bars and set until cold. IF you wish to add some additional chopped nuts or oats on top, do this while the chocolate is still setting. Pink salt flakes are also delicious. Cut with a hot knife.
Cut into lengths and don't eat them all at once!