1/2 cup finely chopped onion 
1/2 cup finely chopped celery 
1/2 cup finely chopped carrots 
1 cup diced potatoes 
1/2 cup margarine 
1 large loaf dried bread, cut into cubes
1 teaspoon salt
1/8 teaspoon pepper
1 cup milk
1 cup chicken broth
2 cups finely chopped chicken, cooked