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Place the bread cubes in a 13 x 9 x 2 inch baking dish coated with nonstick cooking spray.
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In a bowl, combine the egg whites, eggs, milk, sugar, cinnamon, vanilla and salt; pour over bread. Cover and refrigerate for 8 hours or overnight.
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Thirty minutes before baking, remove the berries from the freezer, set aside, and remove the baking dish from the refrigerator.
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Bake, covered, at 350 degrees for 30 minutes.
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In a small bowl, cut the butter into the brown sugar until crumbly. Sprinkle the berries and brown sugar mixture over the French toast. Bake, uncovered, for 15-20 minutes or until a knife inserted near the center comes out clean.