If you can measure and stir, you can make this cake. It is possibly the simplest cake I've ever made, and is low in fat, to boot, using just 3 tablespoons of light olive oil and a couple of eggs. So, if you have three bananas browning accusingly in the fruit bowl, make this. You could use other nuts if you prefer, but I think walnuts and bananas go together well. Set the oven to 180c or 160c fan. Grease and line with parchment paper a 2lb loaf tin. Mash 3 ripe bananas and 160g caster sugar in a bowl. If the bananas are a wee bit lumpy, it doesn't matter. Stir in 3 tablespoons each of light olive or sunflower oil and milk, along with 2 beaten eggs. Stir in 185g of SR flour, 100g of dark chocolate chips or chopped dark chocolate, and 90g of chopped walnuts. Stir well, pour batter into the lined tin and bake for 55 minutes or until a skewer comes out clean. Cool on a wire rack.