In large bowl, mix sugar, cinnamon, salt, egg and egg whites with wire whisk until well blended. Stir in bread cubes and raisins. Stir in milk mixture. Pour into ungreased 1 1/2-quart casserole or 8-inch square (2-quart) glass baking dish. Place casserole in 13x9-inch pan; pour boiling water into pan until 1 inch deep.