**Cook the Noodles:** Boil the noodles according to the package instructions. Drain and set aside.
**Prepare the Sauce:** In a small mixing bowl, whisk together soy sauce, hoisin sauce, rice vinegar, sesame oil, sriracha, and cornstarch, if using. Set aside.
**Cook the Meat:** Heat 1 tbsp of vegetable oil in a large skillet or wok over medium-high heat. Add the ground meat and cook, breaking it up with a spatula, until browned and fully cooked. Remove the meat from the pan and set aside.
**Stir-Fry the Vegetables:** Add the remaining 1 tbsp of oil to the skillet. Add shredded cabbage, carrots, garlic, and ginger. Stir-fry for 2-3 minutes until slightly softened.
**Combine Ingredients:** Return the cooked meat to the skillet and add the noodles. Pour the sauce over the mixture and toss everything together until well coated and heated through.
**Garnish and Serve:** Remove from heat and garnish with green onions. Serve immediately.