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This recipe was submitted by Good Food member musicmartha and has not been tested by our team.
Lightly grease a 15cm (6in) shallow square tin.
Cut the Mars bars into thin slices and put in pan with 75g of butter. Leave on low heat until melted, then beat till smooth.
Stir in the rice crispies. Chill for an hour, (till set).
Next put the chocolate and butter in a bowl and melt over hot water on a low heat and spread ontop.