Mix the oat flakes, milk, cocoa and desiccated coconut the evening before and sweeten as required. Cover the mixture and put it in the refrigerator.
The next morning, mash the banana and mix with the yogurt. If you want, you can also sweeten the yoghurt cream. Then stir the oat flakes well once and pour the cream on top.
Wash the raspberries and spread on top. Finally, add the chocolate and corn flakes and serve.
I use good baking cocoa and no sugar because the sweet banana is enough for me, but everyone should decide for themselves according to their own taste.