Preheat the oven to 350 degrees F. Grease or line with parchment paper a 9x5 loaf pan.
In a medium mixing bowl, combine the flour, baking powder, baking soda, salt and cinnamon. Whisk together and set aside.
Add the bananas to a separate large mixing bowl. Smash the bananas completely with a fork. Add the eggs, honey (or maple syrup), Greek yogurt, oil, vanilla extract, and sourdough discard. Whisk together until fully combined. Add the dry ingredients into the wet and stir until just combined.
Pour the banana bread batter into the bread pan. Bake for 45-55 minutes or until the batter is fully set. Let the loaf cool slightly before enjoying.
The nutrition facts provided are calculated using a third-party tool and are estimates only. Actual nutritional content may vary based on the ingredients and brands you use, as well as portion sizes. For accurate results, please consult a registered dietitian or nutritionist.