Grease and line a 18cm X 22cm rectangular slice tin with baking paper and set aside.
Melt the butter, 100g (two thirds) of the Mars Bars and golden syrup on low heat in a saucepan (or in 30 second bursts in the microwave on 50% power). Please note: the Mars Bars will not completely melt. Mix until the butter and golden syrup are smooth.
Stir through the rice bubbles and the remaining Mars Bar (chopped).
Press mixture very firmly into the prepared tin.
Place milk chocolate and coconut oil/vegetable oil in a heatproof bowl. Microwave on medium for 3 minutes, 50% power, or until just melted, stirring every 30 seconds with a metal spoon. Stir until smooth.
Spread over slice and refrigerate until firm (a minimum of 3-4 hours - or best overnight).
Remove slice from the refrigerator about 30 minutes before cutting into squares with a warm serrated knife.
Thermomix Method
Grease and line a 18cm X 22cm rectangular slice tin with baking paper and set aside.
Place 100g (two thirds) of the chopped Mars Bars, butter and golden syrup into the Thermomix bowl. Melt on 60 degrees, Speed 2 for 3 minutes.
Add the rice bubbles and the remaining Mars Bar. Mix on Reverse, Speed 2, 15 seconds or until completely combined.
Press the mixture very firmly into the prepared tin.
Place the milk chocolate into a clean TM bowl. Melt on 50 degrees, Speed 3 for 2-3 minutes (scraping down the sides of the bowl occasionally).
Spread over slice and refrigerate until firm (a minimum of 3-4 hours - or best overnight).
Remove slice from the refrigerator about 30 minutes before cutting into squares with a warm serrated knife.
Video
Notes
Recipe NotesMelting the butter, golden syrup and Mars Bars - you can melt the ingredients in the microwave, on the stove-top or in a Thermomix. Note: The Mars Bars will not melt completely but will still in small chunks – this is fine. Use a fresh box of rice bubbles or rice krispies - this will ensure your slice is crispy and crunchy!Press the mixture VERY firmly into a greased and lined baking tin - The mixture needs to be pressed down very firmly so that it doesn’t break apart you you cut it.Adding coconut oil or vegetable oil to the milk chocolate - will help it to stop from cracking when sliced. Setting time - Leave in the fridge to set for a minimum of 3-4 hours (overnight is best). Cutting the slice - Take the slice out of the fridge 30 minutes before cutting to allow the chocolate to soften slightly. Use a small serrated knife to cut through the chocolate layer and then through the rice bubbles layer. Storing the slice - Mars Bar Slice can be stored in an airtight container in the fridge for up to 1 week. It can also be frozen for up to 1 month. Golden syrup substitutions - You can replace the golden syrup with corn syrup, honey or maple syrup.