In a sprayed or buttered 9x13-inch baking dish. spread the dressing.
Mix the onion, diced turkey, salad dressing, salt and pepper and cranberry relish.
Spread this mixture evenly over dressing.
Mix together eggs and 1 1/4 cups milk and pour over turkey mixture; refrigerate overnight.
Next morning,combine the soup and the 1 c. milk blending well and pour over mixture. Bake at 325^ for 45 minutes to 1 hour. The last 15 minutes of baking sprinkle cheese evenly over top. YUM!