Place all candy bars, Brew Choc granules and the butter into the Thermomix bowl and melt 10 min/80°C/speed 1.
Add cereal and stir vigorously with a spatula, adding coconut as you do so.
The mix should be very thick, if not add more coconut.
Push into a lined square (20cm) pan, working with a spatula to smooth top.
Refrigerate until set.
Meanwhile melt chocolate with cream on Induction 2 or use the microwave or double boiler. This is such a small amount I don't recommend using the Thermomix.
Spread over top of slice and set.
Remove from pan in one piece and cut into pieces.