Preheat your oven to 350°F (175°C) for even baking.
Lightly grease your baking dish with oil or line it with parchment paper.
In a large mixing bowl, combine rolled oats and salt.
In a separate bowl, mash the bananas until smooth, then mix in water, maple syrup, oil or nut butter, and vanilla extract.
Pour the wet mixture into the dry ingredients and stir until combined. Add optional mix-ins if desired.
Transfer the mixture to the baking dish and spread it evenly.
Bake for 25-30 minutes, until golden brown and a toothpick comes out clean.
Allow to cool for 10 minutes, then slice into bars and enjoy!
