Step 1

Grease a slice tray.

Step 2

Combine Mars Bars and butter in a saucepan. Stir constantly over low heat, without boiling, until the mixture is smooth.

Step 3

Stir in Rice Bubbles and press mixture evenly into greased tray.

Step 4

Melt the chocolate in the microwave on a low setting, stirring every 20-30 seconds.

Step 5

Spread the chocolate evenly over the slice mixture and refrigerate until topping is set.