Peel 4 bananas and mash with a fork.
In a mixing bowl, add in bananas, melted salted butter, dark brown sugar and one whisked egg and stir to combine.
Add in rum or vanilla, baking soda, cinnamon and a pinch of salt. Mix in flour and stir.
Pour mixture into buttered pans and smooth out.
Sprinkle with coconut and bake at 350 for 50-60 minutes.
Let cool and slice.