1. Heat oven to 325 degrees F. Coat a 13 x 9 x 2-inch baking dish with butter-flavored cooking spray.
2. Sprinkle fish on both sides with the mesquite seasoning, salt and black pepper. Place into the prepared baking dish. Pour evaporated milk over fish; dot with butter.
3. Bake at 325 degrees F for 20 to 23 minutes or until fish flakes easily. Garnish with parsley; serve immediately.