Ingredients

Steps

• Grease a 20cm square deep-sided tin with butter.
• Suspend a large heatproof bowl over a pan of simmering water without letting it touch the water.
• Stir the Mars bars and butter in the bowl until melted and smooth.
• Remove from heat, add rice cereal, and fold until evenly coated.
• Press the mixture firmly into the corners and sides of the prepared tin and let cool.
• Melt the plain chocolate over a double boiler and spread it over the cooled base.
• Chill in the fridge until set or overnight before cutting into squares.