Heat the oven to 180/160 C fan.
Butter a 2lb loaf tin and put baking paper on the base and sides.
In a medium bowl whisk until cream 140g softened butter with 140g caster sugar until fluffy and light, then slowly add the 2 beaten eggs with 1-2 spoons of the 140g flour.
Incorporate in the remaining flour, 1 tsp baking powder and 2 mashed bananas, at this point I would advice you to use a spatula.
At this point if you want to give even a better taste add chopped chocolate and nuts.
Pour the mixture into the butter tin and bake for about 50 minutes at 180-200 C. Check the loaf after the first 30 mins. You can test it with a skewer (should be removed cleanly if is done) as time may vary depending on the oven and also on the shape of your loaf tin.
Once done let it cool in the tin for about 10 mins, then remove it on a wire rack.
For the icing, mix 50g icing sugar with 2-3 tsp water. Drizzle the icing on top of the cake and let it set for about 5 mins.