Preheat your oven to 350 degrees and grease a muffin pan.
In a medium bowl, whisk together the oat flour, baking soda, cinnamon, and salt.
In a large bowl, mash the bananas using a potato masher or fork.
Add the avocado oil, eggs, sugar, and vanilla to the mashed bananas and whisk until it's well combined.
Stir the dry ingredients into the wet ingredients.
Fold in the walnuts.
Divide the batter evenly between the muffin cups.
Bake for 25-28 minutes, until you can insert a toothpick and it comes out mostly clean with a few moist crumbs.
Let the muffins cool completely before removing them from the pan. Enjoy as a delicious breakfast or snack!