Preheat oven to 350 F. Rub oil on the inside of a 9 inch bread pan and then line the pan with parchment paper and set aside.
In a large mixing bowl, begin mashing 3 overripe bananas. Add the oil and continue to mash. Then add the maple syrup and repeat until there are no large lumps of banana.
With a whisk, mix in eggs. Add the vanilla and apple cider vinegar. Continue to mix until the eggs are no longer identifiable in the mixture.
Combine the dry ingredients in a separate bowl. Mix with a fork until there are no lumps and everything appears incorporated. Then add dry ingredients to wet ingredients and whisk until the batter is smooth. Avoid over mixing.
Pour batter into the lined bread pan and place in the oven for 45-50 minutes or until you can pierce with a toothpick and have it come out clean. The center will not cook and the loaf will sink if it is not cooked long enough, but the outside does brown easily so be careful not to burn.