. Prepare the Custard Base

1. In a large mixing bowl, whisk together eggs, milk, heavy cream, sugar, vanilla extract, and ground cinnamon until smooth.

2. Assemble the French Toast Casserole

1. Grease a 9×13-inch baking dish with butter or non-stick spray.
2. Layer the sliced bread in the dish, slightly overlapping each slice.
3. Pour the custard mixture evenly over the bread, ensuring every piece is soaked. Cover and refrigerate for at least 30 minutes or overnight.

3. Make the Bananas Foster Topping

1. In a skillet over medium heat, melt the butter.
2. Add brown sugar, cinnamon, and nutmeg. Stir until the sugar dissolves and forms a thick syrup.
3. Add sliced bananas and cook for 2–3 minutes until softened.
4. (Optional) Stir in rum and cook for an additional minute, allowing the alcohol to evaporate. Remove from heat and let cool slightly.

4. Bake the Casserole

1. Preheat your oven to 350°F (175°C).
2. Remove the casserole from the refrigerator and pour the Bananas Foster topping over the bread. Spread evenly.
3. Cover with foil and bake for 25 minutes. Remove the foil and bake for an additional 15–20 minutes until the top is golden and the custard is set.

5. Garnish and Serve

1. Let the casserole cool for 5 minutes.
2. Serve warm, topped with whipped cream or vanilla ice cream, chopped nuts, and a dusting of powdered sugar.