you can still make a "traditional" chicken and rice casserole, using one of the soup brands that is gluten free "amy's" is a good one.
Another good possibility is to substitute a can of coconut "cream", make sure it is cream, not milk for the cream of mushroom soup and add some chopped up fresh mushrooms. You would need to add some water to the cream if you are using this liquid to cook the rice. If you use pre-cooked rice you wouldn't need to do so.
i echo be careful with using milk products, either cheese or cream/milk. Many folks are cross-reactive to casein, a milk protein.