Preheat the oven at 180℃/356℉ (no fan). Line a 23cm x 12cm 5cm pan size with butter, cooking spray and/or baking paper.
In a large bowl, add the 1 cup of finely mashed bananas. Followed by eggs, sugar and melted butter. Whisk until well combined.
Add self-raising flour and salt. Gently mix until just combined and there aren't any flour pockets left. Avoid overmixing.
Pour the batter into the lined baking tin and spread evenly. Take a butter knife and slice the surface of the batter with the knife - this will deliver a straight crack.
Bake for 1 hour, until it's dark golden brown in colour. Once ready, remove and allow to cool in the baking tin for 5-10 minutes. Remove and slice as desired.
Serve with salted butter and dig in!
Notes
Note 1: Substitute the self-raising flour with regular flour and baking powder if you prefer - 2 cups all-purpose flour and 2 1/2 tsp baking powder.