Preheat oven to 350°F. Grease a 9x13" casserole dish.
In a large mixing bowl, combine chicken, cooked rice, broccoli, soup, sour cream, 1 cup of cheese, and seasonings. Mix well.
Spread mixture into the prepared dish and top with remaining cheese.
Cover with foil and bake for 20 minutes.
Remove foil and bake 10 more minutes, or until bubbly and golden.
Let rest 5 minutes before serving.