Preheat the oven to 375℉.
Stir the cashew butter and sugar til completely mixed.
Then mix in oat flour, baking powder, baking soda, and salt. Stir til as combined as can be (it may be quite crumbly at this point).
Add flax eggs and mashed banana. Stir til combined.
Fold in blueberries and separate into baking cups.
Optional: sprinkle a little brown sugar on top of each muffin.
Bake for 20 minutes and let cool. Enjoy!!