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Method
step 1
Put the mars bars and butter in a bowl and place over a pan of hot water. Melt gently, stirring occasionaly until it's mixed together. Take off the heat. then Quickly crush the rice krispies with a spoon, then add them to the mars bars mixture. Press down into a square tin, and leave in the frige for an hour to set.
step 2
Break the chocolate, and melt it over a pan of hot water as you did in the first step. Once cool, remove the mars-bars mixture from the fridge, and pour it over the top. Place in the fridge for another hour to set.
step 3
Once set, remove from the tin and cut into squares. Enjoy!