In a large bowl, beat eggs and cream. Stir in the crab, spinach, bread crumbs, cheese, salt, pepper and nutmeg; set aside. In a skillet, saute the celery, onion, red pepper and mushrooms in butter until tender. Add to the spinach mixture.
Transfer to a greased shallow 2-1/2-qt. baking dish. Bake, uncovered, at 375° for 30-35 minutes or until a thermometer reads 160°. Let stand for 10 minutes before serving. Yield: 12-16 servings.