Preheat the oven to 350 degrees and line a baking sheet with tinfoil and spray with cooking spray.
Put the cornflakes, paprika, and cayenne pepper in a large resealable plastic bag and crush the cornflakes well. Transfer the cornflakes to a bowl and stir in ¼ cup of the barbecue sauce to wet slightly.
Pour two cups of the barbecue sauce in a bowl and set the remainder aside for serving. Dredge the chicken in the barbecue sauce and then transfer to the cornflake mixture and coat.
Transfer to a baking sheet and bake for 1 hour, or until chicken is cooked through.
Serve along side reserved barbecue sauce.
FOR THE BARBECUE SAUCE
In a medium saucepan, whisk together all the ingredients and simmer for 15 minutes.