Place chicken in a shallow nonmetal dish and pour the buttermilk over the pieces, turning to coat. Cover and refrigerate several hours or overnight. (If you forget to plan ahead, you can skip this step, just dip the chicken in buttermilk before coating with the crumb mixture.).
Combine cornflake crumbs, paprika and Cajun seasoning in a gallon size plastic bag. Close the bag and shake well to mix. Take one piece of chicken at a time out of the buttermilk, place in coating bag and shake to coat evenly. Place on a baking sheet or stoneware pan. repeat with remaining chicken. Lightly spritz each piece with nonstick vegetable spray or an olive oil spray. Bake at 425 F for 20-25 minutes.