Line a 8/9″ square tin with parchment paper and leave to the side.
In a large pan, add the golden syrup and butter – melt on a low heat till combined and smooth. Add in the chocolate (chopped) off the heat, and stir until smooth.
Once its melted and combined, leave to cool for a couple of minutes.
In a large bowl, add in the marshmallows, chopped biscuits, and 2 of the bags of Rolos and mix briefly. Pour over the chocolate mix and fold together – pour into the tin and spread till its even.
With the third bag of Rolos, place them on the top and press in to decorate!
Refrigerate until set, chop up, and enjoy!
Notes
I personally used milk and dark chocolate in this because of the sweetness. To make it less sweet, use entirely dark, or use entirely milk if you prefer.
This lasts best in the fridge if its a hot day, or on the side if its cold. Place in an airtight container/tin for storage!
If you have troubles with the mixture splitting in the beginning, its probably the heat thats doing it. Try and keep the heat as low as possible and be careful to not mix like crazy!
You can easily half the recipe for less, but these are so moreish you will want the large piece! Trust me!