Preheat oven to 350 F.
Line a 9 x 5 loaf pan with parchment paper (pro tip, easiest way to get the parchment paper to stick in the pan is to coat it first with a little coconut oil, and then press the paper down inside).
If using flax egg, make that in a small bowl, and set it aside for about 10 minutes, to thicken.
Next, in a blender, add the bananas, real eggs (if using), tahini, coconut sugar, avocado oil, and blend on low until the ingredients are just combined. Note, you can also mash the bananas in a bowl first, then add those same ingredients and combine, but I find that the blender gives it a much smoother consistency).
Pour contents into a medium bowl, and add the flax egg (if using), then add the flour, salt, baking powder, baking soda, cinnamon and sesame seeds.
Mix until just combined.
Pour batter into the parchment-lined loaf pan, and sprinkle some more sesame seeds on top.
Bake for 35-45 minutes, or until a toothpick comes out clean. Enjoy!