For the chicken: In a medium bowl, season the chicken with the salt, paprika, poultry seasoning, garlic powder, and black pepper. Pour the buttermilk and lemon juice over the chicken and refrigerate for 6 to 8 hours, preferably overnight.
Preheat the oven to 400 degrees F. Place a rack on a baking sheet and lightly spray with oil.
For the coating: In a shallow bowl, combine the panko, cornflake crumbs, Parmesan, salt, parsley, paprika, onion powder, garlic powder, and chili powder.
Remove the chicken from the buttermilk and dredge each piece in the crumb mixture. Put the chicken pieces onto the prepared baking sheet. Spray the tops of the chicken with cooking spray.
Bake chicken until golden brown and cooked through, 40-45 minutes.