Firstly put a package whipped cream into a deep bowl. Add 1 cup cold milk onto. Stir with a mixer until a thick consistency. Leave whipped cream fridge for about 20 minutes.
Then, put chocolate sauce into a deep saucepan. Add 2.5 cups milk onto. Put the saucepan onto the stove. Stirring constantly, cook until a thick consistency. Then, take from oven, leave to cool.
On the other hand, cut halley biscuits into mini cubes. Pour half of the cooled chocolate sauce on the whipped cream and stir. Then, add halley biscuits, walnuts and chocolate drops, mix well.
Put springform cake pan onto a flat serving plate.Put halley biscuits mixture into the cake pan.
Leave the marshmallow cake into freezer for at least 2-3 hours. Then pour over the remaining chocolate sauce. Sprinkle coconut, slice and serve.
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