Chicken with Curry and Apples

4 chicken breasts (boneless...and you can really do up to 6 and tender sized work well but cut the cooking time down if you do)
2 apples
1 onion
1/2 ish cup butter
curry powder
1 cup sour cream
1 can cream of mushroom soup

Cut apples and onion and saute with 1/2ish cup butter until they are somewhat soft. Add curry powder....depending on your liking, start with 1 T and go from there. Remove from heat and stir in 1 cup of sour cream and cream of mushroom soup. Pour the mixture over the chicken in a 9x13 pan. Cook covered with foil for 45 - 60 minutes in 350 oven. Serve over rice.