Line a loaf pan (approx 9x5 inches) with baking parchment or a pan liner
Preheat the oven to 350°F / 180°C / 160°C fan assisted
Peel the bananas, break into chunks and place in a bowl.
Use a fork to mash up the bananas until they are smooth and mostly lump free.
Add the whisked egg and vanilla extract and stir to combine.
In a separate bowl ad the flour, sugars, cinnamon (if using) baking powder, baking soda and salt.
Use a spoon to combine.
Tip the wet banana mixture into the dry ingredients and use a spoon to combine until everything is thoroughly mixed together.
Stir in the vegetable oil.
Spoon the mixture into the prepared loaf pan & place in the middle of your preheated oven.
Bake for 35 - 45 minutes or until the banana bread has risen and turned golden brown.
Once done, remove from the oven and leave in the pan for 5 minutes before turning it out onto a wire rack to cool.
Once cool you can add the drizzle of icing (if using)
Place the powdered sugar / icing sugar in a small bowl, add ½ teaspoon of warm water and stir. Add water in ¼ teaspoon increments until you have the desired consistency - you really won't need much at all! You do not want the icing to be too runny that it all runs off the edge of the loaf.
Drizzle the icing over the cake.
Enjoy and remember to track!