If you’re using fresh cauliflower, pulse it in a food processor to create cauliflower rice. If you’re using frozen cauliflower hash browns, you can skip this step.
In a large mixing bowl, combine the cauliflower rice, cooked chicken, 1/2 cup of shredded cheddar cheese, sour cream, melted butter, heavy cream, chicken broth, minced garlic, onion powder, paprika, salt, and pepper. Mix everything until well combined.
Transfer the mixture into a greased 9×13 inch baking dish and spread it evenly.
Sprinkle the remaining 1/2 cup of shredded cheddar cheese on top.
Bake in the preheated oven for about 25-30 minutes or until the casserole is hot and bubbly, and the cheese on top is golden brown.
Remove from the oven and let it cool for a few minutes. Garnish with chopped fresh parsley if desired.