In the bowl of a stand mixer combine the water, yeast and sugar. Let it activate for 5 minutes and start to bubble. Add in the bananas, oil, vanilla, cinnamon, salt, and mix well.
Measure in the flour and mix lightly. With the dough attachment knead on medium speed for 7 minutes or until the dough pulls away from the bowl.
Spray a large bowl with non-stick baking spray and move the dough to the bowl. Cover and let rise for 45 minutes or until doubled in size.
Before the dough is done rising grease a 8.5x4.5 loaf pan.
Once doubled, punch down the dough and pat it into a rectangle on the counter top, then roll it up into a log.
Place seam side down in the prepared pan, cover, and let rise for 45 minutes or risen an inch above the pan.
Preheat the oven to 350 degrees F. while the bread rises.
When it's risen, bake for 25-30 minutes or until it's golden brown and sounds hollow if you tap it.
Let it cool for 5-10 minutes and then move it out of the pan to a cooling rack and let it cool before slicing.