Preheat oven to 350° and grease a 9x5 loaf pan.
In a large bowl, mash bananas until smooth. A few small chunks are okay.
Add the eggs, then the butter and vanilla, mixing well.
Stir in the coconut flour, cinnamon, salt, and baking soda.
Let sit 3-4 minutes to allow the coconut flour to thicken up.
Pour into prepared loaf pan and bake 45-55 minutes or until the center is no longer "jiggly".