Yes! While I do recommend eating while freshly cooked, you can freeze it for up to 1 month. Once cooked, allow your chicken a la king to completely cool before transferring it to an airtight container or freezer bag for storage in the freezer. To reheat, thaw your frozen chicken a la king overnight in the refrigerator and then heat it on the stovetop for an even reheating. If you find at this stage that the sauce has thickened a bit, you could add a splash of milk to thin it out.