Combine panko, pepper, and salt in a shallow dish. Pour buttermilk into another shallow dish.
Dip chicken in buttermilk; dredge in panko mixture, pressing firmly to coat. Shake off excess panko mixture. Place chicken on a wire rack; let stand 10 minutes. While chicken stands, place a jelly-roll pan in oven to heat.
Coat chicken well with cooking spray. Remove hot pan from oven; coat with cooking spray. Arrange chicken in a single layer on pan. Bake at 450° for 23 minutes or until chicken is lightly browned. Serve with Cajun-Creole Dipping Sauce.