To cook the remaining stuffing, place it in a well-buttered heatproof dish with a 5-cup capacity and cover with aluminum foil. Place in the oven 20 minutes before the birds are finished. When the birds are removed, uncover the stuffing, stir, and continue baking for 10 minutes to brown the top. Right before serving, drizzle on some of the strained pan juices and fluff with a fork.