Mash the ripe bananas well.
In a bowl, mix the mashed bananas, sugar, eggs, and melted butter together.
In a separate bowl, sift together the flour, baking powder, and salt.
Add the dry ingredients to the banana mixture and mix until just combined.
If using nuts or chocolate chips, add them at this stage.
Pour the batter into a pan lined with parchment paper.
Bake in a 180°C (356°F) oven for 50-60 minutes.
Place on a cooling rack and let cool completely.