Grease the bottom and sides of a standard-size loaf pan and line it with a strip of parchment paper. In a large bowl, whisk together the mashed bananas, brown sugar, maple syrup, and olive oil. Stir in the oat flour, baking powder, baking soda, ginger, cinnamon, and salt until combined. Fold in the chocolate chips if using.
Pour the batter into the prepared pan. Preheat the oven to 350℉ and rest the batter while the oven heats. Bake for about 50-60 minutes or until a toothpick inserted in the center comes out clean.
Cool in pan for 10 minutes then remove from the pan and place on a wire rack to cool completely.
Notes
Rest the batter. Make sure to let the batter sit while the oven preheats so that the oat flour can properly hydrate, which in turn will create a fluffier crumb.
Another flour. If you can't eat oat flour, substitute sorghum flour or brown rice flour by weight.
Use all maple syrup. If you prefer a naturally sweetened loaf, swap maple syrup for the brown sugar. Alternatively, swap the brown sugar for coconut sugar.
Go less sweet. Bananas are pretty sweet on their own, especially if you use very ripe bananas. Try reducing the amount of added sugar if you wish, and rely on the bananas to impart natural sweetness.
Try other spices. In fall, swap the ground ginger and cinnamon for pumpkin pie spice! Or try a combo of ginger and cardamom. Add a pinch of nutmeg for a slightly different flavor note.