Spray 9×13 casserole dish with nonstick cooking spray.
Transfer completely thawed broccoli florets to cutting board, and cut up any large pieces into smaller, bite sized pieces.
In large mixing bowl, combine Chicken, Broccoli, Cooked Rice, Soup, Sour Cream, Ranch Seasoning, and 1 cup of Cheese. Stir until well combined.
Transfer mixture to casserole dish, and spread out evenly.
Cover with aluminum foil, and bake for 30 minutes.
After 30 minutes, remove foil, evenly top with remaining 1 1/2 cups Shredded Cheese, and sprinkle with French Fried Onions. Then bake UNCOVERED for 10 - 15 more minutes, or until cheese has melted. Season with salt and pepepr to taste, and ENJOY!