Put a knob of butter in a saucepan, on a low heat melt that and add the chocolate and golden syrup.
When melted take off the heat to cool.
When cool add some rice crispies, or broken rich tea biscuits and mini marshmallows.
Stir and put into a greats proof paper lined tray.
Put in the fridge to set.
Do not add the marshmallows too early as they will melt
It will take approx 2 hrs to set in the fridge