Preheat oven to 375 degrees. Chop up the pulled rotisserie chicken if it has large chunks, place in a bowl then add the cauliflower rice and broccoli florets. In a saucepan heat olive oil, add onion. Let sauté for 3-4 minutes. Add heavy whipping cream. Cook for 5-10 minutes stirring often. Stir in cream cheese, if you have cream cheese chunks whisk the sauce. Pour sauce in bowl with chicken, cauliflower rice, broccoli, sea salt and pepper. Stir very well. Place in 9×13 casserole pan, sprinkle with shredded mozzarella. Bake in preheated oven for 45 min. If you like the top crispy broil the top for 4 minutes. Remove from oven, let cool for 10 min and serve.