Rinse and thoroughly dry the trimmed green beans with a clean towel so they blister instead of steam.
In a small bowl, whisk together the soy sauce, oyster sauce, Shaoxing wine, sugar, cornstarch, water, and toasted sesame oil until smooth; set aside.
Heat a wok or large skillet over medium-high heat until hot, 1β2 minutes. Add the peanut oil and heat until shimmering, about 30 seconds.
Add the green beans and stir-fry, tossing every 20β30 seconds, until blistered in spots and crisp-tender, 5β7 minutes.
Push the beans to the sides, creating a clear space in the center. Add the garlic and ginger to the center and stir-fry just until fragrant, 20β30 seconds.
Whisk the sauce again, then pour it around the edges of the wok. Toss with the beans and cook, stirring constantly, until the sauce thickens and coats the beans, 30β60 seconds.
Transfer to a serving plate and serve immediately while hot and glossy.