Whisk together the eggs, milk, vanilla extract and cinnamon in a mixing bowl.
Slice the banana bread into approximately 1 inch thick slices and lay the slices in a 9X13 baking dish.
Pour the egg mixture on top of the bread. Let the bread sit for 1-2 minutes. You may have to work in batches depending on the sizes of the banana bread and pan.
Preheat a griddle over medium heat to 350 degrees Fahrenheit (or use a large skillet). Grease the griddle or pan with the butter.
Then place the coated banana bread slices on the griddle and cook for 2-3 minutes per side until golden brown on both sides. Work in batches if needed.
Serve warm topped with syrup and fresh bananas. Enjoy!
Notes
Refrigerate the leftovers in an airtight container for up to 3 days.