Mix the crushed biscuits with melted butter and milk. Press firmly into a 20×20 cm pan.
Refrigerate while you prepare the filling.
Combine the crushed biscuits, cream cheese, chopped chocolate banana candies, and heavy cream. Beat with a mixer until smooth and well mixed.
Spread the filling over the crust and level evenly.
Heat the cream for the topping until it just reaches a boil. Pour over the chopped/broken chocolate, stir until smooth, then pour over the cake. Refrigerate for 2 hours.
Decorate as desired with crushed biscuits or extra chopped chocolate banana candies, then slice and serve.