Preheat oven to 450ºF.
Melt 2 tablespoons butter in a small saucepan over medium-low heat. Crush crackers and mix in butter until crumbs are moist. Set aside.
Melt the other 2 tablespoons of butter in a small microwave-safe bowl. Pour in a baking pan, coating the cod loin slices.
Bake the cod for 10 minutes.
Remove from the oven. Add the lemon juice, wine, and spread the butter and cracker mixture over fish.
Place back the baking pan on center oven rack and bake about 10 minutes or until fish flakes easily with a fork.
Arrange cod on serving platter. Garnish with parsley and green onions.
Serving Suggestions: Serve with lemon wedges. You may also add coleslaw, zucchini fritters or freshly cooked chips.