In a large bowl, combine the soy sauce, rice wine, salt, potato starch, and sesame oil. Add the chicken and toss to coat. Let marinate for at least 15 minutes.
In a separate bowl, whisk together the pickled chili pepper, sugar, cornstarch, and chicken broth to make the sauce.
Heat a large skillet or wok over high heat and add the vegetable oil. Once the oil is hot, add the garlic and ginger and stir-fry for 30 seconds.
Add the chicken to the skillet and stir-fry for 2-3 minutes until cooked through. Remove the chicken from the skillet and set aside.
Add the bell peppers and onion to the skillet and stir-fry for 2-3 minutes until slightly softened.
Add the scallions and stir-fry for 1 minute.
Return the chicken to the skillet and add the sauce. Stir-fry for 1-2 minutes until the sauce has thickened and everything is well coated.
Serve hot with steamed rice.