reheat the oven at 180°C.
Grease a 9"X 5" loaf tin with butter. Line it with a grease proof paper or dust it with flour.
Sieve the flour,salt and soda bicarbonate.
Chop the walnuts and add it to the flour mixture.
Add also the chocolate chips.
Mix the flour mixture well.
Mash the bananas using a masher or a fork.
Add sugar, milk, oil, yogurt and extract or zest to the mashed bananas. Whip it well with a hand blender or a whisk till it appears frothy.
Add the flour mixture to the wet mixture and mix till the flour is wet. Do not over mix.
Pour the batter into the prepared loaf tin.
Bake the bread for 40 to 45 minutes till it is done. Pierce a toothpick or a fork into the middle of the bread. If it comes out clean, the bread is ready.
Take the tin out of the oven. Leave the bread in the tin for 5 minutes.
Remove the bread and let it cool on a wire rack before serving.