Prepare the Oven
Preheat your oven to 180°C (356°F). Lightly grease your 800 ml loaf pan or line it with parchment paper.Mash the Bananas
Place the ripe bananas in a large mixing bowl. Add the brown sugar and mash everything together using a fork until mostly smooth.Mix the Wet Ingredients
Add the egg and stir until combined. Mix in the vanilla extract, milk, and vegetable oil. Neutral oils like sunflower, canola, or rice bran oil work best because they won't overpower the banana flavor.Add the Dry Ingredients
In the same bowl, add the bread flour, baking soda, and cinnamon. Gently fold the ingredients together until no dry flour remains. Avoid overmixing to keep the bread soft.Fold in the Walnuts
Stir in most of the chopped walnuts, reserving a small handful for the top. Fill the Pan
Pour the batter into the prepared loaf pan. Sprinkle the remaining walnuts evenly over the surface.Bake
Bake at 180°C (356°F) for 60 minutes, or until a toothpick inserted into the center comes out clean or with just a few moist crumbs.Cool
Remove the loaf from the pan as soon as it's baked and place it on a wire rack. Allow it to cool completely before slicing.