Line the square tin with baking paper on the base and sides.
Melt the white chocolate. We placed ours in the microwave for 1 minute, but this may vary for each. Stir occasionally and once melted, add a small amount of pink food colouring to give the desired shade.
Smash the biscuits. You can do this either in the packet, or by placing them in a sandwich bag and beating with a rolling pin.
Add the smashed biscuit pieces and ¾ of the mashmallows, smarties and sprinkles to the mix. Mix together well.
Pour evenly into the tin. Add the remaining ingredients to the top of the mixture.
Place in fridge and leave to cool. Once set, remove from tin, cut into pieces and serve immediately.
With a burst of colour, Cake Angels Rainbow milk chocolate and sugar sprinkles will add a little bit of magic to your cupcakes, cakes, brownies or desserts. Dive in and get decorating!