Preheat oven to 425 degrees.
Combine honey mustard, salt and pepper, green onion and chopped dill or herb. Mix well and keep 1/3 cup of mixture in reserve to drizzle over chicken later.
Crush cornflakes and place in a shallow bowl.
Dip chicken breasts in honey mustard mixture until well coated.
Dredge chicken in cornflake crumbs and coat thoroughly.
Coat baking pan with cooking spray and arrange chicken breasts on pan, making sure sides are not touching..
Bake uncovered about 15 minutes until crust is golden brown and chicken juice runs clear.
Drizzle reserved honey mustard mixture over chicken just before serving.