Preheat oven to 180C Fan and grease a 20cm x 12.5cm / 8” x 5” loaf tin.
Sift all the dry ingredients, the 2 types of flours, bicarbonate of soda, salt, baking powder, cinnamon and sugar into a large mixing bowl.
In a separate bowl, add the wet ingredients by mashing the bananas first with a potato masher or fork, then add the yogurt, eggs, oil and vanilla extract. Mix.
Pour the wet ingredients into the larger bowl with the dry ingredients.
Add the chocolate chips and fold all the ingredients together either using a wooden spoon or a plastic spatula.
Pour cake mixture into loaf tin and bake for 45 minutes until well risen and golden brown.
Check the loaf has cooked by inserting a wooden skewer / cocktail stick into the centre which should come out clean if cooked then remove from the oven.
Allow to cool slightly in the tin before removing and transferring to a wire baking rack.
Once completely cooled store in an airtight container at room temerature or slice into 15 slices and freeze.