Grease a 9-x-13-inch baking dish.
Cut bread into 1-inch cubes.
In a large mixing bowl, whisk together eggs, milk, sugar, vanilla extract, cinnamon and salt until well combined. Add bread cubes and toss until well coated.
Pour French toast mixture into prepared pan. Top with berries, distributing them evenly over top. Cover and refrigerate for at least 1 hour, or up to overnight.
Preheat oven to 350 degrees. Bake for 30 to 40 minutes, until golden brown on top. Serve warm with powdered sugar or maple syrup.