Preheat
oven to 350 degrees F.
Melt
butter in a large frying pan. Add onion slices and saute
until soft, about 5 minutes.
Add
all the remaining ingredients, except for the rice,
chicken and cheese. Break the tomatoes into bite size
pieces.
Bring
the mixture to a boil. Pour into a 2 1/2 quart casserole,
and stir in the rice.
Arrange
chicken on top, skin side up.
Cover
and bake for 45 to 55 minutes.
Preheat
the broiler. Sprinkle cheese over the chicken.
Broil
2 to 3 minutes. (About 4 servings.)