Blanch the beans in boiling water until tender-crisp (about 3 minutes).
Using a slotted spoon, transfer to an ice bath to cool.
Drain and set aside.
Heat the oil in a wok or skillet over medium-high heat.
Add the garlic and ginger and stir-fry until fragrant, about 30 seconds.
Add the drained green beans, Srircha, soy sauce, oyster sauce and sugar and stir-fry for 1 more minute, then add the green onions and stir-fry for 30 more seconds.