Line an 8" square pan
Combine the butter, golden syrup and orange chocolate in a small saucepan. Heat on a very low heat, stirring constantly.
Once all melted, turn off the heat. Add in the cereal and stir together.
Press into the pan and chill for 30 minutes.
Melt chocolate (in a small microwavable bowl, checking and stirring at 20 second intervals). Pour over the krispie treats and spread with a spoon to cover.
Optional: Make the orange glaze by combining the icing sugar, orange colour and flavour and a little water (about 2 tsp) to make a thick, but pourable glaze.
Use a spoon to drizzle the glaze in lines over the melted chocolate. Use a knife, going in the opposite direction to the glaze lines, to create a feathered effect/swirls. Add some pieces of Chocolate Orange for decoration. Let set in the fridge for at least an hour before slicing and serving!