01 - Preheat the oven to 350°F and lightly grease a 9x13-inch baking dish.
02 - Spread the banana bread cubes evenly across the prepared baking dish.
03 - In a large bowl, whisk eggs, whole milk, heavy cream, light brown sugar, vanilla extract, ground cinnamon, nutmeg, and salt until smooth.
04 - Pour the custard over the banana bread cubes, gently press to submerge and saturate all bread. Allow to rest for 10 minutes for optimal absorption.
05 - In a small bowl, stir together melted butter, light brown sugar, and ground cinnamon. Drizzle evenly over soaked bread mixture and scatter nuts on top if using.
06 - Transfer dish to oven and bake for 40 to 45 minutes, until the custard is set and the surface is golden brown.
07 - Let cool for 5 minutes. Garnish with sliced bananas and drizzle with maple syrup as desired before serving.