Broil frozen broccoli in approximately 2 cups of water for 3 minutes. Remove broccoli. RESERVE WATER.
Combine rice, chicken, broccoli, 3 soups, 3 cups of cheddar, salt, and pepper. Add 1 cup of broccoli water if needed to moisten.
Grease a 9" x 13" casserole dish. Cook for 20 minutes, uncovered. Sprinkle remaining cup of cheese over casserole. Cook additional 5-10 minutes, until cheese melted and casserole hot.
For a freezer meal, complete steps 2-4. Dish into a gallon-size freezer bag. Freeze. When ready to cook, thaw completely. Then follow baking instructions. ***I always make a double-batch. Cook half and freeze half.