01 - Submerge green beans in boiling water for 2 minutes, drain, rinse under cold water, and pat dry.
02 - Heat 1 tablespoon vegetable oil in a large wok over high heat. Stir-fry green beans for 3 to 4 minutes until blistered and slightly charred. Remove and set aside.
03 - Add remaining 1 tablespoon vegetable oil to the wok. Fry Szechuan peppercorns for 30 seconds until fragrant. Add garlic, ginger, and scallions, then stir-fry for 1 minute.
04 - Add minced beef, breaking it apart while cooking until browned and just cooked through, approximately 4 to 5 minutes.
05 - Incorporate chili bean paste, soy sauce, oyster sauce, Shaoxing wine, sugar, white pepper, and chili flakes if using. Cook for 1 minute to release aromas.
06 - Return green beans to the wok, tossing thoroughly to coat. Stir-fry for an additional 1 to 2 minutes until heated through.
07 - Drizzle toasted sesame oil, toss to combine, and serve immediately.