Preheat your oven to 350 degrees.
Slice and cube a loaf of sourdough bread and place it into a mixing bowl large enough to cover the bread with water. Let it stand and soak for 10 minutes. With clean hands or food-grade gloves squeeze out any excess water and place it into another mixing bowl.
In a food processor, add the cubed cooked chicken and pulse to chop into a fine ground consistency. Mix in the finely chopped onion ( you can chop the onion in the food processor as well)
Add the ground chicken, onion, eggs, chicken broth, melted butter, salt, pepper, sage, marjoram, seasoned salt, rosemary, and thyme to the bread. Mix everything together.
Press into a 9 x 13 baking dish and bake for 50-60 minutes or until an internal temperature of 165 degrees is reached.