Chicken
Add sliced chicken in a small bowl with soy sauce, cornstarch and sesame oil and mix well. Set aside.
Cook in the wok over medium heat for about 10 minutes. Add the frozen veggies and continue cooking for 5 minutes.
Sweet and Sour Sauce
In a medium pot, heat all the sauce ingredients until dissolved and is thickened, about 10 minutes. Set aside.
Rice Noodles
The 1/4-inch thick rice noodles should be soaked in warm water for 10 minutes. The water should cover the noodles. The water is then drained. Set noodles aside. Should be about 2 cups.
Cooking
Add the noodles to the chicken and veggies and mix well. Add the sweet and sour sauce and allow to cook for another 10 minutes. Toss in the pineapple and nuts at the end. Add sriracha and cilantro if desired.