This is taken from Sweet & Simple Bakes Recipe
3 very ripe bananas
125ml vegetable oil
250g plain flour
100g caster sugar
½ teaspoon bicarbonate of soda
1 teaspoon baking powder
150g dark/milk chocolate (white chocolate or butterscotch chips/morsels)
Preheat the oven to 200ºC/180ºC fan oven/gas mark 6 and line a 12-bun muffin tin with muffin papers.
Mash the bananas and set aside for a moment.
Pour the oil into a jug and beat in the eggs.
Put the flour, sugar, bicarbonate of soda and baking powder into a large bowl and mix in the beaten-egg-and-oil mixture, followed by the mashed bananas.
Fold in the chocolate morsels, then place equal quantities in the prepared muffin tin and bake in the oven for 20 minutes.