Preheat Oven: Preheat oven to 180ºC (356ºF). Grease with butter a loaf pan and line with baking paper, set aside. NOTE: Alternatively, if you have a quality non-stick pan, liberally grease it with melted butter and dust it with a light layer of flour. This will leave your finished bread with smooth sides.
Mix Dry Ingredients: In a medium-sized mixing bowl, add flour, baking powder, baking soda, cinnamon, and salt. Whisk together until well combined. Set aside.
Prepare Banana Mixture: In a separate large mixing bowl, mash the bananas with a fork.
Combine Wet Ingredients: To the mashed bananas, add sugar, melted butter, yogurt, and oil. Whisk until well combined.
Combine with Dry Ingredients: Add half of the dry flour mixture to the banana mixture and whisk until just combined. Then add the remaining half and whisk until incorporated, you can switch to a silicone spatula to mix in the flour.
Transfer Batter: Pour the batter into the prepared loaf pan, smoothing out the top.
Bake: Bake for 40-45 minutes, or until a toothpick inserted into the middle comes out clean or with a few moist crumbs.
Cool: Remove from the oven and allow the bread to cool in the pan for 15 minutes, then transfer to a wire rack to cool completely. Enjoy!