Preheat oven to 425.

Combine buttermilk and mustard in a shallow dish with a whisk.

Add chicken to mixture, turning once to coat.

Heat a small skillet over medium-high heat. Add panko and cook for 3 minutes or until golden, stirring frequently.

Combine panko with remaining coating ingredients in a shallow dish.

Remove chicken from buttermilk and dredge through coating mixture.

Arrange a wire rack on a large baking sheet, coat with cooking spray.

Arrange chicken on rack, coat with cooking spray. Bake at 425 for 13 minutes or until done.