3Cook spinach and drain. Mix rice and spinach together with margarine or butter in greased 9X13 pan. In a bowl, mix cheese, egg milk, rosemary, onion and Worcestershire sauce, then add to rice and spinach. Mix well.
4If using corned beef, break into crumbles and mix it in. Add extra cheese as a topping.
5Bake for 20-25 minutes. Let set for 5-10 minutes before serving.