Preheat your oven to 350°F (175°C). Grease a 9x13-inch baking dish with cooking spray or butter, ensuring it’s evenly coated to prevent sticking.
In a large mixing bowl, vigorously whisk together the eggs, milk, heavy cream, granulated sugar, vanilla extract, cinnamon, nutmeg, and sea salt until the mixture is smooth and all ingredients are fully combined.
Carefully add the cubed brioche to the egg mixture. Gently fold and toss the bread until all pieces are well-coated with the liquid mixture. Allow the mixture to rest for about 10 minutes, enabling the bread to soak up the flavors.
Gently fold in the blueberries, taking care to distribute them evenly throughout the bread mixture without breaking them.
Pour the combined mixture into the prepared baking dish, spreading it out evenly to ensure even baking. Cover the dish tightly with aluminum foil.
Bake in the preheated oven for 30 minutes. After this time, carefully remove the foil and continue to bake for an additional 15-20 minutes, or until the top is beautifully golden brown and the casserole has set in the middle.
Once baked, remove the casserole from the oven and allow it to cool for 5-10 minutes before slicing into portions.
Serve warm, generously drizzled with maple syrup and finished with a light dusting of powdered sugar for an elegant touch.
Notes
For a charming presentation, serve individual portions on colorful plates, garnished with additional fresh blueberries and a sprig of mint.
Keyword blueberries, breakfast, brioche, casserole, French toast