Heat oven to 350 degrees F.
Combine broth, butter, water and chicken base in small saucepan over medium heat until butter is melted and base is dissolved; cool completely.
Whisk in milk and eggs
.Mix together bread, chicken, celery, carrots, onion, parsley, seasoning salt, pepper, salt and celery seed in large bowl.
Pour broth mixture over; toss until liquid is absorbed.
Place dressing into 13 x 9-inch baking pan. Bake until golden brown, about 1 hour, 20 minutes.