Preheat oven to 350°.
Combine first 6 ingredients in a 13 x 9- inch baking dish coated with cooking spray.
Combine milk, vanilla, egg whites, and egg in a large, shallow baking dish, stirring well with a whisk. Add bread, turning to coat. Let stand 5 minutes, turning bread occasionally. Arrange bread in a single layer over berries. Sprinkle evenly with 1 tablespoon granulated sugar. Bake at 350° for 30 minutes or until golden brown and bubbly. Sprinkle evenly with powdered sugar.