Preheat your oven to 375°F (190°C).
In a large bowl, combine shredded chicken, broccoli, cauliflower rice, heavy cream, and sour cream.
Add shredded cheese, garlic powder, onion powder, salt, and pepper to the mixture.
Transfer the mixture to a greased casserole dish.
Top with an additional sprinkle of shredded cheese.
Bake for 25-30 minutes until heated through and the top is bubbly.
Remove from the oven and allow it to cool for 5-10 minutes.
Serve and enjoy your delicious low carb chicken casserole.