Preheat your oven to 350°F (175°C). Grease a loaf pan.
In a small bowl, mix 2 tbsp ground flax with 5 tbsp water and let it sit for 5 minutes to thicken (or use ¼ cup applesauce instead).
In a large bowl, mash the bananas until smooth.
Whisk in the flax mixture (or applesauce), oil, maple syrup, and vanilla extract until combined.
In a separate bowl, whisk together flour, baking soda, baking powder, sugar, and salt.
Gradually add the dry ingredients to the banana mixture. Stir until just combined (do not overmix).
Pour the batter into the greased loaf pan.
Bake for 40-45 minutes or until a toothpick inserted in the center comes out clean.
Let the bread cool for 10 minutes before removing from the pan. Serve and enjoy!