Preheat Your Oven: Start by preheating your oven to 350°F. Grease a 4x8 inch loaf pan or line it with parchment paper.
Prepare the Bananas: In a mixing bowl, mash the ripe bananas with a fork until they form a smooth puree.
Combine Wet Ingredients: Stir the melted butter into the mashed bananas. Then, add the baking soda, and a pinch of salt. Mix well.
Sweeten It Up: Add the coconut sugar to the banana mixture, followed by the beaten egg and vanilla extract. Stir until all the ingredients are thoroughly combined.
Oats and More: In a separate bowl, combine the old-fashioned rolled oats, baking powder, and ground cinnamon.
Mix Everything Together: Gradually add the dry oat mixture to the banana mixture, stirring until just incorporated. Be careful not to overmix; simply combine until there are no visible streaks of dry ingredients.
Optional Add-Ins: If you desire extra texture and flavor, fold in the chopped nuts or chocolate chips.
Baking Time: Pour the batter into your prepared loaf pan.
Bake to Perfection: Bake in the preheated oven for approximately 45-60 minutes. To check for doneness, insert a toothpick or cake tester into the center of the loaf; it should come out clean. Depending on your oven, start checking around 40 minutes.
Cooling and Serving: Once done, remove your oat-based banana bread from the oven and let it cool in the pan for about 10 minutes. Afterward, transfer it to a wire rack to cool completely.