In a medium bowl add eggs, mashed bananas, vanilla and cinnamon. Mix all the ingredients using a whisk or a big fork.
Preheat a cast iron skillet and grease it with 1/2 tsp butter.
Using a medium ladle, add your first pancake 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 the pancake.
Once done remove the pancake using the same silicone spatula and set on a wide plate. Stack all the pancakes on top of each other.
Repeat from #3 until the entire batter is gone, making sure you add that 1/2 tsp of butter before each one.