For an extra layer of flavor, consider adding a pinch of cumin or chili powder to the chicken and rice mixture. To prevent the rice from becoming too dry, ensure there is enough liquid in the casserole before baking. You can add a little more chicken broth if needed. This casserole is delicious served with a dollop of sour cream or guacamole. Leftovers can be stored in the refrigerator for up to 3 days. Reheat in the oven or microwave.