In a bowl, start by adding the oat flakes and the milk, mix well and let the oat flakes soak for 10 minutes.
Meanwhile, in a bowl, break the bananas into smaller pieces, mash them well and add the eggs, mix very well.
Add the cocoa powder, the salt and the baking powder, mix again.
Once you’ve done that, pour in all the oat flakes we left soaking, mix until combined.
Now, transfer all the batter to a removable bottom round baking pan lined with nonstick baking paper. The baking pan I’m using here is 20 cm in diameter.
Top it with crushed walnuts and almonds, to taste.
Take to a preheated oven at 180°C (356°F) and bake for 40 minutes.
Meanwhile, in a bowl, add the semisweet chocolate and the milk, mix well.
Once the pie has baked through, remove it from the oven, unmold it and pour the chocolate topping all over it.
Serve.