Heat oven to 180 C° (350 F°) and fold a 20 cm (7.9 inches) loaf pan with parchment paper or grease with oil.
Add all ingredients to a high speed blender or food processor and blend the oatmeal banana bread batter until smooth. The oats should become flour.
If you desire, stir in (without blending) additional ingredients such as walnut chunks, pumpkin seeds or chocolate chips.
Pour the batter into your prepared loaf pan. Bake in hot oven for 30 to 40 minutes, or until a toothpick inserted into the center of your oatmeal banana bread comes out clean. For a moist texture, do not overbake the loaf.
Remove from the oven and let cool in the loaf pan for about 15 minutes. Finally, take it out of the pan and let cool completely before slicing.