Another recipe for using up overripe bananas (though they don't need to be overripe for the recipe to work). It is also fairly healthy so a good after school treat for the kids.
The recipe I got this from uses a smaller tin than I wanted to use so I doubled the recipe but you can adapt it to the size tin that you have.
Begin by mixing 150g each of wholemeal flour, oats and demerara sugar. Then add 200g butter and rub in until you have a breadcrumb like mix.
Spread half the mix over the base of a greased tin (mine was 10 x 7 inches).
Then top with the remaining mix.
Then sprinkle with about 50g chocolate chips.
Allow to cool and cut into slices.