Add the mung bean noodles into the wok and follow by oyster sauce, fish sauce, sesame oil, sugar, and white pepper powder. Stir continuously to blend well. Add mung bean sprouts and do a few quick stirs. Push the noodles to the side of the wok and add the remaining 1 tablespoon of oil into the wok. Add the beaten eggs and let is cook for about 10 seconds before you push the mung bean noodles to cover the top of the eggs. Let it cook for another few seconds before you flip the noodles over. Gently break the eggs into pieces and blend well with the noodles. Add chopped scallions into the noodles, stir a few times, dish out and serve immediately.