Core: Chop mars bars finely and place with butter into a pot

Heat at a low temperature until melted

Turn off heat

Pour rice bubbles into mixture

Spoon mixture into a shallow pan & pat down to form a 3cm layer

Topping: Break up chocolate into small pieces

Place copha and chocolate into another pot and heat t low temperature until fully melted

Stir until consistent

Pour and spread evenly over the slice

Refrigerate until firm