In a mixing bowl, whisk together the eggs, milk, vanilla extract, and ground cinnamon until well combined.
Preheat a skillet or griddle over medium heat and add 1 tablespoon of butter.
Dip each slice of banana bread into the egg mixture, soaking both sides but ensuring they don't become too soggy.
Once the skillet is hot, place the soaked banana bread slices onto the skillet. Cook for about 3-4 minutes on each side, or until golden brown and slightly crispy.
Add the remaining tablespoon of butter to the skillet if needed, and repeat with any remaining slices.
Serve warm topped with maple syrup, powdered sugar, and sliced bananas if desired.
To enhance the flavor, consider adding chopped walnuts or chocolate chips to the banana bread before baking.