01 -
Preheat oven to 350°F. Lightly grease a 9x13-inch baking dish with unsalted butter or nonstick spray.
02 -
Distribute the cubed brioche or challah evenly in the prepared baking dish. Scatter the diced apples uniformly over the bread.
03 -
In a large mixing bowl, whisk together the eggs, whole milk, heavy cream, granulated sugar, ground cinnamon, ground nutmeg, vanilla extract, and salt until completely combined.
04 -
Pour the custard mixture evenly over the bread and apples. Gently press the bread down to ensure it absorbs the liquid.
05 -
In a small bowl, mix the light brown sugar and ground cinnamon. Stir in the melted unsalted butter until fully incorporated.
06 -
Sprinkle the brown sugar mixture evenly across the surface of the casserole.
07 -
Allow the assembled casserole to rest for 15 to 30 minutes at room temperature, or cover and refrigerate overnight for optimal flavor development.
08 -
Bake in the preheated oven for 40 to 45 minutes, or until the top is golden brown and the center is set.
09 -
Let the casserole cool slightly before serving. Dust with powdered sugar and offer warm with maple syrup if desired.