Fill a large skillet 2/3 full of water. Over medium-high heat, heat water to boiling. Add the cod fillets; reduce heat to medium and simmer, turning fillets occasionally, until fish flakes easily with a fork, about 8 to 10 minutes. Remove fish with slotted spoon and drain well. Transfer to a large bowl and break into smaller pieces. Add the Roasted Tomato Mashed Potatoes, egg white, green onion and parsley. Mix well.