Mix your ground flax with water and set aside.
Peel and mash your 3 bananas in a medium size bowl until no clumps are there!
Add in your flax egg, peanut butter, sugar and vanilla and mix to combine.
Add in all the dry ingredients to the wet mixture and stir until it just comes together. Don't over mix or the dough could get tough.
Put the batter into a parchment or greased lined loaf pan. Dollop 1-2 Tbsp of peanut butter on the top and with a knife or toothpick swirl the peanut butter throughout the bread.
Bake in a 350 degree oven for 35-45 minutes until a toothpick comes out clean.
Let cool completely, then slice up and serve! It can be for breakfast or dessert :)