Grease a 900g (2lb) loaf tin with a 17 x 9 x 9cm (6½ x 3½ x 3½in) base measurement and line it with non-stick baking parchment.
Preheat the oven to 180°C/350°F/Gas Mark 4.
Place all the ingredients in a mixing bowl and beat for about two minutes until well blended. An electric mixer is recommended, but hand beating with a wooden spoon is also suitable.
Spoon the mixture into the prepared tin, ensuring an even surface.
Bake for approximately one hour or until the cake is well-risen and golden brown. You can check if it's done by inserting a fine skewer into the center; it should come out clean.
Allow the cake to cool in the tin for a few minutes. Then, gently loosen it with a small palette knife and turn the cake out. Remove the lining paper.
Place the cake on a wire rack to cool completely.
Slice the cake thickly before serving. Enjoy!
Notes
Use ripe bananas for a sweeter taste.
Toast walnuts for extra flavour and crunch.
Don't overmix; keep the batter lumpy for a moist loaf.