First make the cream mixture. Boil the milk in a pot. After it simmers a bit, add the sugar. Stir until it melts.
Pour the contents of the chocolate cream packet into it and stir nonstop until thickened. Remove from the stove and leave to cool.
Arrange a layer of biscuits in a suitable tray but not tightly next to each other. Smear with the prepared cream, arrange another layer of biscuits, cream again and so on until out of cream.
Smear the very top with cream as well. Sprinkle generously with coconut flakes and put in the fridge for a few hours to harden.