Cook noodles according to package directions until al dente. Drain and set aside.
In a small bowl, whisk together soy sauce, rice vinegar, sesame oil, ground ginger, chili garlic sauce, garlic powder, and black pepper until well combined.
In a large bowl or wok, toss the cooked noodles with the prepared sauce until evenly coated.
Add chopped green onions and toss to combine.
Serve immediately, garnished with desired toppings such as sesame seeds, bell peppers, or broccoli.