Prepare your tin. This amount will make half a square brownie tin, or a small loaf tin size. If using silicon, your tin should be fine. If using metal, you probably want to line it with baking paper first.

In a small saucepan, over a low heat, stir the butter, marshmallows and chocolate together until melted. Turn the heat off.

Stir the cereal in and mix well. Immediately tip into your tin and press down with a palette knife or the back of a metal spoon.

If doing a chocolate topping, break the rest of the chocolate into small chunks and melt either in 20 second bursts in the microwave, or over a pan of boiling water. Tip the chocolate over the crispy mix and level or smooth out..

If adding toppings, pop them on before the chocolate sets.

Place in the fridge to set completely, then carefully cut into squares (or triangles)!

Enjoy!