Combine first 3 ingredients in a large zip-top plastic bag; seal and marinate in refrigerator 30 minutes. Remove fish from bag; pat dry with paper towels. Discard marinade.
Preheat oven to 450°.
Combine cornmeal, cornstarch, salt, and pepper in a shallow dish. Dredge fish in cornmeal mixture.
Lightly coat fish with cooking spray. Place fish on a baking sheet coated with cooking spray, and bake at 450° for 15 minutes or until the fish flakes easily when tested with a fork.
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