01 -
Preheat your oven to 320°F (160°C) fan/convection. Lightly grease a 9x4 inch (23x10cm) loaf pan with butter. In a bowl, mash the bananas with a fork until mostly smooth but still with some small chunks. Roughly chop the walnuts and set aside about 1/3 of them for topping.
02 -
In a large bowl, whisk together the mashed bananas, melted butter, egg, and brown sugar until well combined. Add the flour, baking powder, and cinnamon, then stir just until no dry patches remain (don't overmix). Fold in 2/3 of the chopped walnuts, distributing them evenly throughout the batter.
03 -
Pour the batter into your prepared loaf pan and smooth the top with a spatula. Sprinkle the reserved walnuts over the surface. Bake for 45-50 minutes, or until a wooden skewer inserted into the center comes out clean or with just a few moist crumbs attached.
04 -
Allow the banana bread to cool completely in the pan at room temperature (about 1 hour). This helps the texture develop and makes it easier to remove from the pan without breaking. Once cooled, run a knife around the edges and turn out onto a serving plate.