Preheat the oven to 325 degrees. Line a muffin tin with paper liners.
Place the gluten free oats in a food processor and process on high speed to grind into a somewhat fine flour.
Place the bananas in a large bowl and mash with a fork. Add the ground flax seed, oil, and vanilla and stir. Add the sugars and stir again.
Add the gluten free flour, ground oats, baking soda, and salt, and stir well. Spoon into the muffin pan, filling each liner ⅔ full. Sprinkle some gluten free oats on top if desired.
Bake at 325 degrees for 20-23 minutes.
Let the muffins cool in the pan for a few minutes before removing.
Notes
These muffins will stay fresh in a ziploc bag for about 4 days.You can freeze these muffins in a freezer bag - they should stay fresh for about 3 months.If you aren't gluten free, go ahead and use regular flour in this recipe.