1. Bring chicken broth to a boil in a medium, covered saucepan.
2. Add barley and return to boil.
3. Reduce heat to low, cover and cook 45 minutes or until barley is tender and liquid is absorbed.
4. In the meantime, melt butter in skillet.
5. Add curry powder, mushrooms and onion.
6. Sauté 3 to 5 minutes or until onion is translucent.
7. Add mushroom-onion mixture to cooked barley along with remaining ingredients.
8. Preheat oven to 350°F.
9. Spoon into greased 2-quart casserole.
10. Cover and bake 45 minutes.
11. Remove cover and bake 5 minutes longer.