Follow these detailed steps to create your own Szechuan Spicy Noodles:

1. Prepare the Noodles:
   Cook the noodles according to the package instructions. Once cooked, drain and rinse under cold water to stop further cooking. Set aside.
2. Toast the Szechuan Peppercorns:
   Heat a dry pan over medium heat and add the Szechuan peppercorns. Toast them until they are fragrant, about 2-3 minutes. Remove from heat, let them cool, and grind them into a coarse powder.
3. Make the Sauce:
   In a small bowl, combine the soy sauce, dark soy sauce, black vinegar, sugar, and salt. Mix well and set aside.
4. Cook the Aromatics:
   Heat the vegetable oil in a large pan or wok over medium-high heat. Add the dried red chilies, minced garlic, and minced ginger. Stir-fry for about 1 minute until fragrant, being careful not to burn the garlic.
5. Combine with Noodles:
   Add the cooked noodles to the pan, followed by the sauce mixture. Toss everything together to coat the noodles evenly.
6. Add Broth and Seasonings:
   Pour in the chicken or vegetable broth and the ground Szechuan peppercorns. Stir well to combine. Allow the mixture to simmer for 2-3 minutes, letting the noodles absorb the flavors.
7. Incorporate Optional Ingredients:
   If using optional proteins or vegetables, add them at this stage. Stir-fry until they are cooked through and well incorporated with the noodles.
8. Finish with Sesame Oil and Green Onions:
   Drizzle the sesame oil over the noodles and sprinkle with chopped green onions. Give the noodles a final toss.
9. Serve:
   Transfer the Szechuan Spicy Noodles to a serving dish. Garnish with additional green onions or toasted sesame seeds if desired.