01 - Preheat oven to 350°F. Grease an 8×8 inch baking dish with butter or nonstick spray.
02 - Arrange the croissant pieces evenly in the prepared dish. Scatter chopped chocolate evenly over and between the croissant pieces.
03 - In a mixing bowl, whisk together eggs, milk, cream, sugar, vanilla, and salt until well combined.
04 - Pour the custard mixture slowly and evenly over the croissants, lightly pressing down so all pieces soak up the mixture. Let sit for 10 minutes.
05 - Bake for 35 to 40 minutes, or until the custard is set and the top is golden brown.
06 - Cool for 10 minutes before dusting with powdered sugar. Serve warm, with fresh berries if desired.