This rice bake should almost always be cooked at 350 for an hour but there are some variables to consider. You can use small cut or frozen chicken pieces at this temperature and cook for an hour or if using thawed or small chicken pieces then you might find that the dish is finished around 40 minutes. The added time in the oven helps the cheese to get to that crisp and gooey goodness we want though.u003cbr/u003eCooking it at 375F for 45 minutes can be okay if you have thawed or already cooked chicken involved or if the chicken is in smaller pieces (like 1in cubes or thin tenderloins). If using frozen extend the time to 1 hour.