My advice is not to freeze Moo Goo Gai Pan once it has been fully assembled as a dish, as the vegetables tend to become rather squidgy. However, you can freeze the chicken and the stir-fry sauce in separation. Freezing the Stir Fry Sauce: Once the stir-fry sauce has been assembled, you can pour it into a freezer bag or freezer-safe airtight container and freeze it for up to 3 months. Don't forget to label it with content and date, so you know what it is and still safe to eat. Cooked chicken: Allow any cooked chicken to cool down completely, then load it into a plastic freezer bag or airtight container, being sure to get rid of any excess air. It will be good for up to 2 to 3 months. Defrost in your fridge before using it.