1
Adjust rack to middle position (middle and top positions for 12 servings) and preheat oven to 400 degrees. Wash and dry produce. Coat a 9-by-13-inch baking dish (two 9-by-13-inch baking dishes for 12) with nonstick cooking spray.
Dice brioche into ½-inch pieces.
Cut prosciutto into 1½-inch pieces. Roughly chop parsley.