Preheat oven to 350°F. Line a 9x5-inch loaf pan with parchment paper and lightly grease the exposed ends of the pan
In a small bowl, combine the 2 tablespoons ground flaxseed meal with the ⅓ cup water. Set aside to thicken while you measure everything else
If you haven't already, mash 3 bananas until completely smooth. Mash the bananas on a flat surface like a cutting board for maximum surface area.
In a separate large bowl, stir together mashed bananas, ½ cup olive oil, ½ cup maple syrup, 1 tablespoon vanilla, and ground flaxseed mixture. Stir until everything is well incorporated.
Add 2½ cups blended oats, 1 tablespoon baking powder, 1 teaspoon baking soda, 2 teaspoons cinnamon, ½ teaspoon ginger, and 1 teaspoon salt directly into the bowl with the liquid ingredients. Fold dry ingredients into liquid ingredients until just combined and no large streak of flour remain. Batter will appear a little lumpy.
Pour Healthy Banana Bread batter into loaf pan. Tap the pan lightly against the countertop to level the batter out. Top the batter with sliced bananas or oats if using.
Set timer for 1 hour. Check banana bread at 1 hour for deeply golden brown color and a toothpick inserted into center comes out clean. Depending on your oven and the actual amount of bananas in the batter, Banana Bread may take up to 1 hour and 15 minutes.