Preheat the oven to 180⁰C. Grease 8 paper muffin cups or a muffin tray.
In a blender, add the bananas, egg, coconut oil, maple syrup or carob honey and vanilla. Blend on low speed until almost smooth. In a large bowl, add all remaining ingredients (flour, baking soda, baking powder and cinnamon). Gently mix the dry ingredients into the wet ingredients. Fill the muffin cups with the mixture and bake for about 20 minutes.