Creating Brioche French Toast Casserole is straightforward. Follow these easy steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Baking Dish: Grease a 9×13-inch baking dish with butter or cooking spray.
3. Cube Brioche: Cut the brioche into cubes and place them evenly in the prepared baking dish.
4. Whisk Eggs: In a large bowl, whisk together the eggs, milk, heavy cream, sugar, vanilla extract, cinnamon, and salt until well combined.
5. Combine Mixtures: Pour the egg mixture over the brioche cubes, ensuring all pieces are soaked.
6. Chill: Cover the dish with plastic wrap and refrigerate for at least 30 minutes, or preferably overnight.
7. Bake: Remove the cover and bake in the preheated oven for 25-30 minutes, until the top is golden and puffed.
8. Cool Slightly: Allow the casserole to cool for a few minutes before serving.
9. Serve: Drizzle with maple syrup, and garnish with fresh berries and powdered sugar if desired.

These steps will guide you in creating a delicious and crowd-pleasing dish effortlessly.