Preheat your oven or toaster oven to 350F.
In a large mixing bowl, mash the bananas. Add the wet ingredients and stir until combined.
If you want, you can mix in all of the dry ingredients up to the flour, and stir to combine. Then add the flour last, and mix gently until the batter is mixed together. Or, you could combine all the of dry ingredients together in a separate bowl, then mix them into the dry ingredients.
Transfer the mixture to a loaf pan, and put in the oven for 40-50 minutes (30-40 if you use a convection oven), or until a skewer comes out clean when pushed into the loaf, or until the top is slightly browned and the loaf is springy to the touch.
Let cool for a few minutes, then loosen the sides and tip out of the pan. Slice, and serve.