Smash the bananas with a fork. Mix them with the porridge mixture, oat flakes, linseeds, coconut oil, maple syrup and cinnamon.
Line a baking tray with baking paper, add the mixture and spread it smoothly with a spoon.
Pre-bake the mix at 180°C for 10 minutes.
For the filling, mix the berries with maple syrup, chopped dates and cinnamon. Spread the berry filling on the base.
For the topping, mix the muesli with coconut oil, chopped nuts and maple syrup to a crumbled mass and put it over the berries.
Bake it for another 20 minutes at 170°C until done, remove from oven, let cool completely and cut into pieces.
Serve with fresh berries.