In a mixing bowl, combine bread cubes and 1 cup cracker crumbs.

Stir in broth, eggs, salt, celery, onion, chicken and mushrooms.

Spoon into a greased 2 qt. casserole.

In a saucepan melt butter; add remaining cracker crumbs and brown. Sprinkle over casserole.

Bake at 450 degrees for 1 hour.