To prepare oats banana buttermilk pancakes, in a large bowl, mash the peeled bananas. Whisk in the eggs, buttermilk, vanilla extract until you get a fairly smooth mix.
In a small bowl, mix the dry ingredients together with a fork or whisk.
Add this to the wet ingredients and stir until combined. A few small lumps of flour are fine. Mix in the oil. You can keep this batter covered overnight in the fridge, or keep aside for 15-20 minutes.
Take a nonstick or seasoned cast iron pan. Grease the surface with a dot of butter using a kitchen paper.
Pour a ladle of batter on the medium hot pan, around 1/4 cup. Do not spread it out. Once you see bubbles around the circumference, flip and cook other side for 30-45 seconds. Pile up on a plate and serve with some honey or maple syrup on top.