Preheat the oven to 350 degrees F. Lightly oil a 9x5" loaf pan with oil.
In a large bowl, mash the banana until it's almost smooth.
Add all the ingredients in the order listed to the mashed banana, whisking together, and then adding the dry ingredients starting with the quick oats with a large spoon. Stir until combined.
Stir in optional add-ins if desired. Or, you can sprinkle the add-ins on top of the loaf before baking.
Bake the loaf for 45-55 minutes until golden and firm on top. The top of the loaf should lightly spring back when pressed.
Cool the loaf in the pan for 30 minutes. Then, slide a knife around the loaf to loosen and gently remove it from the pan. Place on a cooling rack until completely cool.
You can slice and spread the loaf with vegan butter or coconut butter, or it's wonderfully moist and delicious on its own. Wrap tightly and keep in the fridge. Enjoy!