Chow Mein noodles are often vegan, however, they can contain eggs. Make sure to read the label at the store! When adding only vegetables and plant-based protein to your noodles, it can easily be made into a fully vegan dish — eating out is another story, though. Asian recipes are often made with oyster sauce or fish sauce, chicken broth or egg noodles. Make sure to ask whether any of these ingredients are used and whether it’s possible to make your Chow Mein fully vegan.