For the bread pudding: Preheat the oven to 375 degrees F.
In a large bowl, combine the eggs, cream, vanilla, sugar, cinnamon, salt and Brie if using. Whisk vigorously to combine. Add the croissants; toss well to combine. Let sit for 6 or 7 minutes.
Transfer the mixture to a baking dish and bake until golden brown, 20 to 25 minutes.
For the bananas Foster sauce: Meanwhile, melt the butter in a large saucepan over medium-high heat. Add the bananas and cook for 1 to 2 minutes. Add the brown sugar, stirring until dissolved. Add the walnuts, rum, granulated sugar and cinnamon. Cook, stirring frequently, until thick and saucy, about 5 minutes.
Serve the bread pudding hot, topped with some of the sauce.
If you have fresh croissants, toast them in a 375-degree oven for 3 to 5 minutes. Let cool before proceeding with the recipe.
This recipe was created by a contestant during a cooking competition. It has not been tested for home use.