Preheat your oven to 350 degrees and spray a muffin pan with coconut oil.
Peel and mash the bananas, if they aren’t quite ripe enough I will sometimes place them in the microwave for a few minutes to age them a bit (I also find when the batter is war when adding the baking soda that they muffins rise better).
Combine the coconut oil, mashed bananas, coconut sugar, brown sugar, vanilla extract, walnuts until fully blended.
Add the flax meal and liquid mixture to this (some people call this a flax egg) to the wet mixture.
In a separate bowl, whisk together the salt, flour(s) and baking soda. Then slowly stir into the wet ingredients until just combined. Try not to over stir.
Fill each muffin well with the batter then bake for about 14 to 16 minutes depending on how your oven heats and the final size of the muffins. Let cool for a few minutes before enjoying.