Boil noodles until al dente according to package directions. Drain, rinse with cold water, and set aside.
In a bowl, whisk together soy sauce, chili oil, rice vinegar, sesame oil, garlic, ginger, sugar, and Szechuan peppercorns.
Heat vegetable oil in a wok over medium-high heat. Add bell pepper, carrot, and cabbage. Stir-fry for 3–4 minutes until slightly tender but still crisp.
Stir in cooked chicken, tofu, or shrimp and heat through.
Add noodles and pour the sauce over. Toss until evenly coated and heated through.
Garnish with chopped green onions, sesame seeds, or crushed peanuts. Serve hot with lime wedges if desired.
Notes
This recipe is great for busy weeknights.
Adjust the spice level by adding more or less chili oil.