Line the base and sides of a 20cm springform tin with baking paper.
Place the butter into the Thermomix bowl and cook for 2 minutes, 80 degrees, Speed 2 to melt. Add the biscuits and mix for 8 seconds, Speed 9 or until finely crushed.
Transfer to the mixture to the prepared tin and push down with the back of a spoon to smooth over the base. Place into the fridge until required.
Place 200 grams of Caramilk chocolate into a clean and dry Thermomix bowl. Cook for 3 minutes, 50 degrees, Speed 2 or until melted. Place into a separate bowl and set aside to cool slighlty.
Combine the gelatine with the boiling water and mix well. Set aside to cool slightly.
In the same bowl, add the cream cheese (softened), caster sugar and vanilla extract. Mix for 30 seconds on Speed 5. Scrape down the sides of the bowl and mix for a further 30 seconds, Speed 5 or until smooth and creamy.
Add the thickened cream and mix for 30 seconds, Speed 5.
Scrape down the sides and add the melted chocolate and gelatine mixture. Mix for 20 seconds, Speed 5. Scrape down the sides of the bowl and mix for a further 15 seconds, Speed 5.
Pour the mixture over the base. Grate the remaining Caramilk chocolate over the top of the cheesecake before placing into the fridge for 8 hours (preferably overnight) to set.