Remove chicken from brine, pat dry, cut into bite-size pieces. Toss in cornstarch and set aside.
Mix the sauce ingredients in a bowl and set aside. Add 1 TBSP of sauce mix to the cornstarch covered chicken pieces and stir.
Place pan or wok on mid-high heat and add vegetable oil. When the oil is hot, add the chicken and cook for a few minutes, until brown on outside.
Add the shrimp when chicken is browned.
Add mushrooms, cabbage, carrots and the whites of the scallions/green onions. Stir gently or "toss" until mushrooms are brown. Don't overcook, you don't want mushy veggies for this.
Add garlic, the green part of scallion/green onion and bean sprouts and stir-fry for 1 minute.
Remove chicken, shrimp and vegetables to a nearby bowl.
Place the dried up, sesame oil coated chow mein noodles in the wok or pan and cook until the bottom of the noodles start to brown, roughly 1 minute.
Add back the chicken, shrimp and veggies to the pan/wok
Pour in the sauce, toss with all the ingredients for 30 seconds until well blended.
Remove from heat, serve immediately, and garnish with chopped green onion.