Line a bowl with cling film making sure it’s hanging over the edges, this is to helo you remove the tiffin once it’s set.
Place the butter and the golden syrup into a saucepan over a medium heat and stir until the butter has melted. Don’t boil it.
Add the dark chocolate and milk chocolate into the pan and stir until it’s completely melted and well combined.
Take it off the heat, then add in the Maltesers, biscuits, and cranberries. Mix until it’s well combined.
Spoon the mixture into the lined bowl, then pat it down firmly. Pop it into the fridge to set. You can also speed up the process by putting it in the freezer.
Once it’s set, melt the white chocolate over a pan of simmering water, then spoon it over the top and let it drizzle down.
Decorate with some Xmas themed sprinkles. Pop it back into the fridge so the chocolate firms up, then you can cut it into portions and enjoy.