Preheat oven to 200c.
Blitz biscuits in blender for ease.
You can lightly grease the cake tin or leave it, I don't think it makes much difference. Then put in the tray as a base.
Stir together the egg and sugar.
Melt the butter and stir into the mixture.
Sieve and add flour; mix until smooth, but not fluffy.
Spread half of the batter into the pan.
Add cocoa to the remainding batter and add that on top.
Sprinkle anything you want on top, I would recommend Cashew nuts or almonds.
Bake for 25 mins.
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