Preheat your oven to 350°F (175°C). Grease your loaf pan with a little olive oil or line it with parchment paper for easy removal after baking.
In a large mixing bowl, use the potato masher to mash the three overripe bananas until smooth.
Add the extra virgin olive oil, honey, beaten egg, and vanilla extract to the mashed bananas. Whisk everything together until well combined and smooth.
In a separate bowl, whisk together the white whole-wheat flour, baking soda, salt, and ground cinnamon.
Gradually add the dry ingredients to the wet ingredients, stirring gently.
Gently fold in the coarsely chopped walnuts and dark chocolate chips.
Pour the batter into the prepared loaf pan and smooth the top with a spatula. Bake for 50-60 minutes or until a toothpick inserted comes out clean.
Once baked, remove the bread from the oven and let it cool in the pan for about 10 minutes. Then transfer it to a wire rack to cool completely before slicing.