In a small bowl, combine the butter, chives and garlic. Shape into a 3-in. x 2-in. rectangle. Cover and freeze until firm, about 30 minutes., Flatten each chicken breast to 1/4-in. thickness. Cut the butter mixture into six 1-in. pieces; place one piece in center of each chicken breast. Roll up chicken from a long side; tuck ends under. Secure with toothpicks. , In a shallow bowl, combine the cornflakes, parsley and paprika. Place buttermilk in another shallow bowl. Dip the chicken into buttermilk, then coat evenly with cornflake mixture. , Place chicken in a greased 13-in. x 9-in. baking dish, seam side down. Bake, uncovered, at 425° for 35-40 minutes or until no longer pink. Discard toothpicks.