Preheat oven to 375 degrees F. Lightly spray a baking sheet with olive oil.
Combine the crackers and corn cereal crumbs, sesame seeds, cayenne, and garlic powder in a shallow bowl. Reserve.
In a large bowl, combine egg whites, yogurt, Dijon mustard, and salt. Add the chicken pieces and coat thoroughly with the yogurt mixture.
One at a time, dip the chicken pieces in the cracker mixture, packing crumbs onto chicken. Arrange the chicken on a baking sheet and spray lightly with olive oil cooking spray.
Bake for 45 to 50 minutes, or until juices run clear when chicken is pierced with a knife.