Combine chicken and buttermilk in a shallow dish; cover and chill 1 hour.
Drain chicken, discarding liquid.
Combine chicken and flour in a medium bowl, tossing to coat.
Preheat oven to 47
Place baking sheet in oven.
Combine egg and egg white in a small bowl.
Combine crushed cornflakes and next 5 ingredients (through ground red pepper) in a shallow dish.
Working with 1 chicken strip at a time, dip into egg mixture; dredge in cornflake mixture. Repeat procedure with remaining chicken, egg mixture, and cornflake mixture. Arrange chicken in a single layer on preheated baking sheet coated with cooking spray. Lightly coat chicken with cooking spray.