Preheat oven to 375 degrees. Add some non-stick spray to the sides of a 9x13 casserole dish.
Into the casserole dish add: orzo, cooked chicken, chicken stock, cream, seasonings, garlic, spinach, tomatoes, lemon juice and half of each cheese. Give it a good mix to ensure the ingredients are evenly combined and in a flat layer.
Top with remaining cheese and bake for 40 minutes or until the orzo is tender.
When you remove from the oven, allow it to sit for about 10 minutes to allow the pan juices to be absorbed and set up (otherwise it may seem a little liquidy).
Give it a good mix using a large serving spoon. Serve hot and enjoy! We love to pair this with a chopped salad kit.