1Heat oven to 450°F. Line 13x9-inch pan with foil; spray with cooking spray. Spray another 13x9-inch pan with cooking spray.
2In small bowl, place crushed cereal. In another small bowl, beat egg white and water until frothy. Dip chicken breast halves into egg white mixture; sprinkle with Cajun seasoning. Roll chicken in cereal to coat; place in foil-lined pan.
3In second pan, toss all roasted vegetable ingredients to coat.
4Place both pans in oven; bake 18 to 23 minutes, stirring vegetables once halfway through baking time, until chicken is fork-tender and juices run clear and vegetables are crisp-tender.