Prepare the Base: Start by adjusting a cake ring to a diameter of 26 cm and place it on a cake plate. Take the butter biscuits and put them into a freezer bag. Use a rolling pin to crush them into fine crumbs. Mix the melted butter, cocoa, and cinnamon with the biscuit crumbs until everything is evenly coated.
Assemble the Base: Press the biscuit mixture firmly into the bottom of the cake ring on the plate to form a solid base.
Add the Bananas: Peel the bananas and cut them in half horizontally. Arrange the banana halves over the biscuit base, ensuring they cover the base completely.
Prepare the Pudding Filling: In a bowl, mix the vanilla pudding powder with sugar and a few tablespoons of cold milk until smooth. In a saucepan, heat the remaining milk until it boils, then stir in the pudding mixture. Keep stirring until it thickens and comes to a boil.
Cool the Pudding: Pour the cooked pudding into a bowl and cover the surface with cling film to prevent a skin from forming. Let it cool for about an hour.
Combine with Crème Fraîche: Once the pudding has cooled, mix in the crème fraîche until well combined. Spread this pudding cream over the banana layer.
Top with Whipped Cream: In a separate bowl, mix the cream with cream stiffener and vanilla sugar, and whip until stiff peaks form. Spread the cream over the pudding layer, then grate the chocolate on top for decoration.
Refrigerate and Serve: Chill the cake in the fridge for at least 5 hours. When ready, carefully remove the cake ring and serve chilled. Enjoy your slices of this delectable banana delight!