Preheat oven to 350°F, and grease a 9x5" loaf pan.
In a large bowl, stir together the oat flour, quick oats, almond flour, baking powder, cinnamon, and salt.
In a smaller bowl, whisk together the bananas, canola oil, brown sugar, flax eggs, and vanilla until smooth. Some banana lumps are ok.
Add the banana mixture to the dry ingredients and stir until just combined.
Pour the banana mixture into the prepared loaf pan, and bake for 60–70 minutes, or until the loaf is a nice golden brown and a toothpick inserted into the center comes out clean.
Allow to cool completely before slicing and serving.