Preheat oven to 450 degrees. Lightly coat a dark colored nonstick cooking sheet with cooking spray. Place sour cream in a medium bowl. Set aside. Combine cornflakes, cornmeal, old bay seasoning, Italian seasoning, garlic powder, peppercorn mix, and ground cayenne in a medium bowl. Set aside. To prepare chicken, place chicken to the left of your work space. Place sour cream to the right of the chicken. Place cornmeal mixture to the right of the sour cream. Place cooking sheet to the right of the cornmeal. Using your left hand, pick up a piece of chicken and place in sour cream. Still using only your left hand carefully dredge chicken piece, ensuring that it is well covered in sour cream. Then place chicken piece in cornmeal mixture. Using your right hand, carefully press chicken into cornmeal mixture. Once chicken piece is covered in cornmeal mixture, use your right hand to place it on the cooking sheet. Repeat until all chicken pieces are breaded. Lightly spray chicken pieces with spray butter or an oil mister. Bake 30-40 minutes, depending on size of chicken pieces.