Preheat oven to 350 F (180 C).
Prepare a glass baking dish, bread tin, or muffin tin with cooking spray or oil.
Add the bananas, oil/butter, liquid sweetener, milk, vanilla, baking soda, salt, cinnamon and nut butter if using to a big mixing bowl. Stir to combine.
Then add the flour, oats and optional add-ins (chocolate chips, chia seeds, nuts, raisins, etc). Stir until combined.
Pour mixture into a baking dish, bread pan or muffin tin. For a more *aesthetic* bread, sprinkle the top with oats or more chocolate chips.
Bake for 25-30 minutes. You know it's done when you stick a fork, knife, or toothpick in it and it comes out clean with no batter on it!