Sauté onion and celery in butter until tender. Set aside.
Combine chicken broth, salt, pepper, and sage in a large mixing bowl; mix well. Add sautéed vegetables, eggs, and breadcrumbs; stir well.
Spoon dressing into a greased 3 1/2-quart shallow baking dish. Bake at 350° for 45 minutes or until lightly browned.