In a large bowl, beat the eggs with the oyster sauce, salt, sugar, sesame oil, white pepper, and five spice powder.
Combine the cornstarch and water into a slurry, and then beat it into the eggs. Stir in the bean sprouts and scallion whites.
Heat the wok until smoking. Add the oil. Then add the egg mixture. As the egg sets, slowly stir to scramble, just until the eggs are cooked through. Plate and sprinkle with the scallion greens. Serve.