Prep the Baker: Grease a 9x13 inch baking dish with butter or cooking spray. This is where the magic will happen!
Cube the Bread: Cut the brioche into bite-sized cubes and place them evenly in the greased baking dish. It’s like creating a cozy bed for the custard!
Mix the Custard: In a large mixing bowl, whisk together the eggs, milk, heavy cream, sugar, vanilla extract, cinnamon, and salt. Whisk until it’s nicely blended and frothy.
Pour it Over: Pour the egg mixture over the brioche cubes, making sure all the bread is evenly saturated. You want every piece to soak up that glorious custard!
Cover and Chill: Cover the dish with plastic wrap or foil and refrigerate overnight. This lets the flavors meld and ensures a perfectly custardy texture.
Bake: Preheat your oven to 350°F (175°C). Remove the cover and bake the casserole for 40-45 minutes until the top is golden brown and the center is set.
Let it Cool: Allow it to cool for a few minutes before serving to allow it to set further.
Serve: Cut into squares and serve warm with a drizzle of maple syrup and a sprinkle of powdered sugar.