1. In a skillet, sauté the mushrooms and onions in 3 Tablespoons butter until tender.
2. Add chicken, potatoes, pimientos, parsley, cream, bouillon, salt, rosemary and pepper; heat through.
3. Spoon into a greased 2-qt.
4. casserole.
5. Melt remaining butter; combine with the bread crumbs and sprinkle over casserole.
6. Bake, uncovered, at 350° for 20-25 minutes or until crumbs are toasted.
7. Garnish with parsley if desired.