Cut French bread into medium cubes. Spread them evenly in a greased baking dish. Let the bread sit slightly to become a little dry for better texture.

In a large bowl, whisk eggs, milk, cream, sugar, vanilla, cinnamon and salt. Mix until smooth. This mixture will create the soft custard for the casserole.

Slowly pour the egg mixture over the bread cubes. Make sure all bread pieces are covered. Gently press bread so it absorbs the liquid evenly.

Cover the dish with plastic wrap. Place it in the refrigerator for at least 6 hours or overnight. This helps flavors blend beautifully.

Before baking, mix melted butter and brown sugar. Spread it over the top of the casserole. This creates a sweet caramel-like crust while baking.

Preheat oven to 350°F. Bake the casserole for about 45 minutes. The top should be golden brown and the center should be set but soft.

Let the casserole cool for 10 minutes before serving. Sprinkle powdered sugar on top. Serve warm with maple syrup for best flavor.