Step 1

Lightly grease an 8x8 inch (20x20 cm) square baking pan.

Step 2

Add the butter to a large saucepan and gently melt the butter over low heat.

Step 3

Add the chopped Mars bars to the butter and gently stir the mixture as the Mars bars begin to melt.

Step 4

Continuously stir the mixture until smooth. If the butter and chocolate bars start to separate, remove from the heat and whisk until smooth.

Step 5

Once melted, turn off the burner and stir in the Rice Kripies/Rice Bubbles.

Step 6

Spoon the batter into the prepared pan, and gently press it down. You can lightly grease a spatula or spray your hands with non-stick cooking spray if you find the mixture keeps sticking to the spatula or your hands.

Step 7

Add the chocolate chips/ chopped chocolate to a heatproof bowl. Microwave on medium power for 45-second intervals, stirring between each. Once the chocolate is almost melted, stir until smooth.

Step 8

Spread the mixture over the bars and let sit for 2 hours at room temperature, or until the chocolate is hardened before slicing into bars. *