Does it have to be a casserole? Plain old roasted chicken works well -- reheats fine or can be eaten cold, and is easy to do in quantity.
If you specifically want a casserole, I've had good luck with this: saute onions in fat until limp, then stir in raisins (which you have plumped in water), diced apples, and some curry powder (not all curry is hot). Cook a little (apples shouldn't get totally mushy), then set that aside and brown the chicken in the same pan. Now put chicken in a casserole dish, cover with the other stuff, and bake at 375 until safe (apply meat thermometer). Serve over rice.
Sometimes I add slivered almonds, or sometimes pine nuts, to the pan.
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If you specifically want a casserole, I've had good luck with this: saute onions in fat until limp, then stir in raisins (which you have plumped in water), diced apples, and some curry powder (not all curry is hot). Cook a little (apples shouldn't get totally mushy), then set that aside and brown the chicken in the same pan. Now put chicken in a casserole dish, cover with the other stuff, and bake at 375 until safe (apply meat thermometer). Serve over rice.
Sometimes I add slivered almonds, or sometimes pine nuts, to the pan.