Line serving dish with paper towels; set aside. Combine flour and cornstarch in small bowl. Beat eggs in another small bowl; set aside. Place cornflake crumbs in another small bowl.
Coat pickle spears in flour mixture, shaking off excess flour. Dip pickle in egg; roll in cornflake crumbs. Repeat with remaining pickles.
Heat oil in large nonstick skillet over medium heat. Cook four pickles at a time, 1 to 2 minutes on each side or until golden brown. Remove to prepared serving dish. Repeat with remaining pickles. Serve with mustard, if desired.