Step 1

Cut the brioche bread into 1-inch cubes. Place the cubes evenly in the greased 9x13 baking dish with butter or oil.

Step 2

In a large mixing bowl, whisk together the eggs, whole milk, maple syrup, vanilla extract, and ground cinnamon until well combined.

Step 3

Pour the custard mixture evenly over the brioche cubes, ensuring that all the bread is coated.

Step 4

Add berries (optional) and press down slightly on the bread to help it absorb the custard. Cover the dish tightly and allow the brioche and custard mixture to soak for at least 4 hours, preferably overnight.

Step 5

Preheat oven to 350°F (175°C).

Step 6

Bake for 35 minutes. Uncover and bake for 15-20 more minutes until the top is golden brown and the center is set. Cool slightly and drizzle with some maple syrup or dust with powdered sugar for an extra touch of sweetness, if desired.