First, mix the ingredients for the cake sponge, line a round cake pan with parchment paper, and bake in a preheated oven at 180 degrees for about 20–25 minutes. (If possible, make the sponge cake a day in advance for best results.)
While the cake is cooling, prepare the filling and cook it thoroughly, saving the whipped cream for last.
Once the cream has cooled, add the whipped cream and beat with a mixer for 10 minutes.
Cut the cooled cake in half and spread the cooled whipped cream between the layers; you can also add bananas if desired.
Finally, sprinkle powdered sugar on top before serving.