In a large saucepan over medium heat, combine the heavy cream, cream cheese, and minced garlic. Stir until the mixture is smooth and well-combined.
Add the shredded mozzarella cheese and half of the Parmesan cheese to the saucepan, stirring until melted and creamy.
Season the sauce with Italian seasoning, salt, and black pepper to taste.
In a large mixing bowl, combine the shredded chicken with the cauliflower florets. Pour the creamy Alfredo sauce over the chicken and cauliflower, mixing until everything is evenly coated.
Transfer the mixture to a greased casserole dish (9x13 inches) and spread it out evenly.
Top the casserole with the remaining Parmesan cheese and an extra sprinkle of mozzarella cheese for a golden finish.
Bake in the preheated oven for 25-30 minutes, or until the cheese is bubbly and lightly golden on top.
Once done, remove from the oven and let it cool for a few minutes before garnishing with freshly chopped parsley.
Notes
Let the casserole cool for a few minutes before serving.