For the Krispie Mars Layer
Line a 9″x9″ baking tin.
Gently melt the butter, Mars Bars, and golden syrup in a saucepan on a low-medium heat. Keep the saucepan on the heat and keep stirring until all ingredients are fully melted and formed a smooth sticky paste. Be patient, as this will take a few minutes.
Once smooth, remove the saucepan from the heat and stir in the rice krispies until they’re evenly covered – work quickly as it’ll begin to harden fast! (You can either add the rice krispies to the saucepan or pour the sticky melted mars bar mixture on top of the rice krispies, either works!).
Once fully combined press your mars bar krispie layer in to the baking tin (I use the back of a spoon or a spatula for this as it’s really sticky!).
For Topping and Decoration
Chop the Mars Bars and set aside. Melt the milk chocolate in the microwave in 10 second bursts until smooth, stirring between each burst.
Pour the melted milk chocolate on top of the rice krispie layer and smooth out (tip: if you give the tin a shake on a flat surface then it will even the melted chocolate out!)
Arrange the chopped Mars Bars on topping as decoration. Gently press them down to help them stick in to the chocolate!
Chill in the fridge until fully set before cutting in to pieces (this should take 1-2 hours). Enjoy!

Notes