Prepare the Oats: In a bowl, combine 120 g of oats with 250 ml of warm milk. Let it sit for 10 minutes to allow the oats to absorb the milk and soften.

Mix the Batter: In a separate bowl, mash the bananas until smooth. Add the eggs and whisk together.

Add the softened oats to the banana mixture. Stir in the baking powder and cocoa powder until well combined.

Bake the Dessert: Preheat your oven to 180°C (350°F). Grease a baking dish or line it with parchment paper.

Pour the batter into the prepared baking dish and spread it out evenly.

Bake in the preheated oven for 30 minutes or until a toothpick inserted into the center comes out clean.

Prepare the Chocolate Topping: While the dessert is baking, melt the dark chocolate in a double boiler or microwave. Once melted, stir in 30 ml of milk until smooth and glossy.

After the dessert is done baking, let it cool for a few minutes. Drizzle the melted chocolate over the top and sprinkle with chopped nuts.

Serve: Let the chocolate set for a few minutes before slicing. Serve warm or at room temperature and enjoy your delicious, low-calorie dessert!