Start the oven at 175 degrees Celsius.
Mix the sugar and eggs with an electrical mixer.
Mash the bananas and add the with the egg mixture.
Melt the butter and add it in the batter.
Add the flour, vanilla sugar, baking powder and the milk in the batter while stirring.
Butter a baking form and and sprinkle the bread crumbles evenly in the form.
Pour the batter in the baking form and place the cake in the middle of the oven for 50 minutes. Take out the cake and let it cool down.
Mix the margarine to a soft mousse. Add the icing sugar, vanilla sugar and the cream cheese and mix it well. Spread the frosting evenly on the cake.