Preheat the oven to 325° F and grease a loaf pan. You can also use mini loaf pans or a muffin tin and reduce the bake time.
In a medium bowl mix together the dry ingredients — oat flour, baking soda, baking powder, cinnamon, and salt.
In a separate bowl mix together the wet ingredients very well — eggs, olive oil, maple syrup, and vanilla extract. I usually mix quickly for 1+ minutes. Add mashed banana and mix again until well incorporated.
Mix together the wet and dry ingredients until well-combined, but do not over mix.
Fold in any chocolate, nuts, fruit, etc. to the bowl. Transfer batter to the prepared loaf pan.
OPTIONAL, but recommended: Add toppings before baking. I like to add hemp seeds + coconut. You can use other seeds, nuts, or even more banana sliced up!
Move to the oven and bake the loaf for 50+ minutes. I often find it takes 55-60 minutes (sometimes even longer if there’s lots of banana and moisture), but I like to give it a check at 50 minutes just in case.
Once a toothpick is inserted into the center of the loaf and comes out clean — without batter or too much of the bread — it is done.
Remove from the oven and let cool.