In a bowl, toss the chicken pieces with salt until evenly coated. Then, add the cornstarch and 2 tbsp soy sauce to the chicken and mix again until every piece is well-coated.
Bring 2 pots of water to a boil (one medium and one large). Add the cornstarch-coated chicken to the medium pot and boil the chicken for 4 minutes. Strain it out and set the chicken aside.
Add the chow mein noodles to the large pot of boiling water and cook according to package (3 mins) using a colander strain the noodles and set aside the colander. If the noodles stick together, rinse under water to separate them before adding them to the pan.
Heat 1 tablespoon sesame oil and 2 tablespoons canola oil in a large wok or skillet set over medium high heat.
Stir-fry the chicken for 2 minutes and set aside onto a large plate.
Add another 1 tablespoon sesame oil and 2 tablespoons canola oil to the hot pan and cook the veggies along with the garlic and ginger, for 3 minutes, remove the veggies from the pan and set aside with the chicken.
In a small bowl mix together the oyster sauce, 3 tablespoons soy sauce, rice vinegar , brown sugar and chili sauce together until fully combined, set aside.
Add another 1 tablespoon sesame oil and 2 tablespoons canola oil to the pan and stir fry the cooked chow mein noodles along with the sauce for 5 minutes on high heat. Some pieces will get nice and carmely and crispy. Add the veggies and chicken toss to combine.