Preheat oven to 180C/Gas 4
Butter a loaf tin and line the sides and base with baking parchment or use a loaf tin liner.
Cream together the butter and sugar until light and fluffy. Add in one egg and a tablespoon of flour and mix well then do the same with the other. The flours stops the mixture curdling.
Mix in the remaining flour, baking powder, mashed banana, walnuts and chocolate chunks.
Pour the mixture into your prepared loaf tin and bake in your preheated oven for 30-35 minutes or until a skewer comes out clean.
Serve in slices drizzled with tahini and runny honey.