Holding the chicken with drum part side up, pull the skin down towards bone to completely remove. Discard skin.
In a wide, shallow dish, combine buttermilk marinade ingredients: buttermilk, hot sauce, salt, sugar, and pepper.
Add chicken and massage to coat. Marinate in the refrigerator for at least 4 hours or overnight for best results.
Line a baking sheet with foil. Set aside.
In a large bowl, combine cornflake coating ingredients: cornflakes, fresh parsley, salt, cayenne pepper, garlic powder, and pepper. Toss to combine. Add olive oil and toss together until cornflakes are moistened.
Let chicken stand at room temperature for about 30 minutes. Drain from marinade and immediately dredge in cornflake mixture, patting down crumbs to fully coat.
Arrange in a single layer on prepared baking sheet and bake in a 375 F oven for about 35 to 40 minutes or until golden on the outside and thermometer inserted into thickest part reads 165 F. Remove from pan and serve hot.