Heat the vegetable oil in a wok or large skillet over medium-high heat.
Add the dried red chili peppers to the hot oil and stir-fry for about 1 minute until they become fragrant.
Add the minced garlic, grated ginger, and sliced green onions to the wok. Stir-fry for another minute until the aromatics release their flavors.
Increase the heat to high and add the marinated chicken to the wok. Stir-fry the chicken for about 5-7 minutes until it is cooked through and slightly browned.
Sprinkle the ground Sichuan peppercorns over the chicken and continue to stir-fry for another minute. The Sichuan peppercorns will add a distinctive numbing and citrusy flavor to the dish.
Taste the chicken and adjust the seasoning if needed. Add more soy sauce or salt if desired.
Once the chicken is cooked and well-coated in the spicy sauce, remove it from the heat.