Step 1: Preheat your oven to 350°F (175°C). Cut the French bread into 1-inch cubes and place them in a large mixing bowl.
Step 2: In another bowl, whisk together eggs, almond milk, vanilla extract, granulated sugar, and ground cinnamon until well combined.
Step 3: Pour the egg mixture over the bread cubes and gently fold until all pieces are coated. Allow to sit for 10-15 minutes to soak.
Step 4: In a separate bowl, combine frozen berries, granulated sugar, ground cinnamon, and cornstarch. Toss gently to coat.
Step 5: In the baking dish, layer half of the soaked bread mixture, followed by half of the berry mixture. Repeat and sprinkle with granulated sugar.
Step 6: Cover with foil and bake for 30 minutes. Remove foil and bake for an additional 15-20 minutes until golden brown.
Step 7: Let cool slightly before serving warm, drizzled with maple syrup or dusted with powdered sugar.