First of all, do not let the frozen chicken and rice thaw on the counter. Since there are meat ingredients, it poses a risk that can lead to food borne illness. You can thaw it in the refrigerator in an airtight container, or in the microwave on a defrost setting in a microwave safe bowl. Once it's completely thawed, you can heat it in the microwave until it's hot all the way through. If the rice is too dry, try adding a tablespoon of dairy-free milk at a time.