1. Melt the butter in a heavy 12 inch skillet over moderate heat.

2. Add the celery and saute, stirring occasionally for 3 minutes or until crisp tender.

3. In a small bowl, whisk together the cornstarch and chicken broth until smooth and add to the skillet.

4. Bring to a boil, stirring. Reduce the heat to moderately low.. Simmer, stirring occasionally for 5 minutes.

5. Add marjoram, thyme, salt, pepper and parsley.

6. Preheat the oven to 350.

7. Scatter the onion rings over the bottom of a buttered 12 by 8 by 2 baking dish.

8. Spoon the celery mixture over them and cover tightly with aluminum foil. At this point the casserole can be cooled to room temperature and kept in the refrigerator for up to 24 hours.

9. Bake , covered for 50 to 55 minutes.