Prepare the bananas by peeling and mashing them using a fork.
In a medium bowl, add eggs, mashed bananas, vanilla and cinnamon. Mix everything using a whisk or a fork.
Preheat cast iron skillet and add 1/2 tsp of butter. Use a medium ladle to add your first pancake batter into the skillet.
Cook on small heat until lightly brown on one side, then carefully flip using a silicone spatula.
Continue cooking on the other side until done, making sure not to burn it.
Once done, remove pancake from the skillet using a silicone spatula and stack on a wide plate.
Repeat the entire process until the whole butter is gone, making sure to add 1/2 tsp of butter before each pancake.