There's only one thing to do...
Choc-chip banana cake!
Before you start, you'll need a 2lb loaf tin. I could only find a 1lb loaf tin and so made a 1 lb loaf, half a dozen muffin-sized buns and a mini loaf. It was as frantic a search through the cupboards as you might imagine (I didn't dig out the tin until I had the batter ready to go).
Preheat the oven to 190C (gas mark 5).
3 medium-ish bananas
150g soft brown sugar
75g butter or marg
250g self-raising flour
100g chocolate chips
Mash the bananas and set them to one side. If you add a teasoon of sugar, they seem to be easier to mash. I know not why, but 'tis so.
In a saucepan, gently heat the butter or marg and the brown sugar until both are melted and mixed together. Don't let the mixture boil. As soon as you have a nice thick caramel-ish mixture that is all combined, set it to one side to cool.
In a large bowl, sift together the cinnamon and self-raising flour.
Beat the eggs into the cooled sugar and butter mix.
Pour eggs + sugar + butter into the flour and stir. You should end up with a slightly lumpy batter (irrespective of the earlier sifting...).
Add the mashed banana and the chocolate chips and stir. If the batter seems quite runny, that's fine.
Pour into a 2lb loaf tin (or many cakes tins until you have used up all the batter) and bake for 50 minutes, or until a skewer inserted into the middle comes out clean
You'll want to check it after 30 minutes - if the top is browning too much, cover with some greaseproof paper.
If you make individual buns, they'll only need c.25 minutes. A 1lb loaf should only need about 40 minutes.
Put the kettle on and enjoy.