Lightly coat the chicken with potato starch in a large shallow dish. Heat the oil in a wok or large frying pan over high heat, and then stir-fry the chicken until seared and hot but not cooked all the way through. Remove the chicken from the wok and set aside, leaving any extra oil from the chicken in the wok. Add the scallions, garlic, ginger, some chiles and Szechuan peppercorns and stir-fry until fragrant, being sure to scrape up the browned bits left over from the chicken. Return the chicken to the wok until cooked through. Stir in the peanuts in the last few moments of cooking. Serve nice and hot!
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