1 med. onion, chopped
1/4 lb. butter
2 cans (16 oz.) tomatoes
1 tsp. salt
1/4 tsp. pepper
1 tsp. oregano
2 c. cooked rice
2 oz. mozzarella cheese, sliced

Cook onion in butter until tender. Add tomatoes, seasonings and rice. Pour into a baking dish. Bake at 350 degrees for 20 minutes. Place mozzarella slices on top of casserole. Bake for 5 more minutes. Serves 8.