Line a baking tray (or plate) with baking paper and set aside until needed.
Place THREE of the Mars Bars into your Thermomix bowl and blitz for 5 seconds on speed 7.
Add the softened cream cheese to the Thermomix bowl with the crushed Mars Bars and blitz for 10 seconds on speed 5. Scrape down the sides of your Thermomix bowl and mix for a further 10 seconds on speed 5 or until combined – it may take a little longer if your cream cheese isn’t completely soft.
Roll the mixture into balls (I made mine dessert spoon sized) and place on tray. Continue until all the mixture has been used.
Place tray/plate into the freezer for a minimum of half an hour, as you want the cheesecake balls to be very firm.
In the meantime, break the milk chocolate into pieces and place in a microwave safe bowl to melt (you can also melt the chocolate in a bowl sitting above a saucepan on boiling water on the stove). I cook the chocolate for 30 second spurts until it’s almost melted and then stir it until it had completely melted.
Remove the balls from the freezer. Poke a skewer into the bottom of the balls and dip them in the melted chocolate. Place on a wire rack to set. Repeat until all the balls are coated.
Decorate the balls while the chocolate is still soft a small piece of Mars Bar. Repeat until all of the mixture has been used.
Place the Mars Bar Cheesecake Balls back into the freezer for half an hour, or until the milk chocolate has set before serving or transferring into an airtight container in the fridge.