1. Preheat the oven to 350°F (180°C). Lightly grease a loaf pan (about 11×5 inches) and line it with a strip of baking paper. Set aside.

2. For the streusels, combine the flour with sugar and butter. Rub between your fingers to get different-sized streusels. Place in the fridge until needed.

3. Mash the bananas for the dough and set aside. Melt the butter and let cool down slightly, then add it to a large mixing bowl with the sugar and beat until light and fluffy. Add the eggs one at a time and mix well after each addition. Add the milk and vanilla extract and stir to combine. Mix the flour with baking powder and salt in a separate bowl, then add to the large bowl – stir until just combined. Add the mashed bananas and fold in. Pour the batter into the prepared loaf pan and smooth out the top. Add Nutella and Biscoff on top of the batter and fold into the batter with a spoon. Do not over-mix, you want to be able to see swirls in the banana bread later on.

4. Sprinkle the streusels from the fridge on the batter and bake the banana bread for about 60-70 minutes or until a wooden skewer inserted into the bread comes out clean. Let the banana bread cool down in the pan for about 10 minutes, then carefully remove it and let cool completely on a wire rack.