Whisk teriyaki marinade, soy sauce, ginger, brown sugar, red pepper flakes, and black pepper together in a large glass or ceramic bowl. Add chicken and toss to evenly coat. Cover the bowl with plastic wrap and marinate in the refrigerator for 5 hours.
Heat a wok over medium-high heat. Add scallions, garlic, and oil; stir-fry for about 1 minute. Add broccoli, snow peas, and bell pepper; stir-fry for 2 minutes more. Add stir-fry sauce and mix until vegetables are coated.
Remove chicken from the marinade and shake off excess. Discard the remaining marinade. Add chicken to the wok and stir-fry until chicken is no longer pink in the center and the juices run clear, about 5 minutes.
Nutrition data for this recipe includes the full amount of marinade ingredients. The actual amount of marinade consumed will vary.
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