Start the oven at 175 degrees Celsius.
Cut the chocolate in medium size pieces.
Mix the bananas to puree with a fork.
Mix the eggs and the sugar with an electrical mixer.
Melt the margarine and pour it down in the batter.
Pour the mashed bananas, sugar, vanilla sugar, flour, baking powder and the milk in the batter while stirring with the electrical mixer.
Pour in the chocolate bites in the batter.
Butter a baking form, and sprinkle the bread crumbles in the form.
Pour the batter in the baking form, and place it in the middle of the oven for approx fifty minutes.
Take out the cake and let it cool down before serving it.