To marinate the chicken, place the sliced chicken in a medium bowl. Add baking soda, corn starch, oil and soy sauce and stir evenly to combine.
For the sauce, combine the chili garlic sauce, oyster sauce, hoisin, soy sauce and rice vinegar in a small bowl.
For the stir-fry, heat a large sauté pan or wok over high heat for about 1 minute. When the pan begins to smoke, swirl in the oil, garlic, and chilies. Stir and scrape until the garlic is light brown, taking care to not burn it. Toss the chicken into the pan and stir constantly until the chicken just starts to turn opaque and is fragrant. Stir in the bell peppers, onion and nuts, and cook for about 1 minute, until the onion begins to turn translucent.
Stir in the sauce and pinch of pepper and cook, stirring, until the sauce coats everything and thickens. Stir in scallion greens and cook for another minute or until the chicken is cooked through. Stir in the remaining scallions and serve.
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