**Cook the Noodles:**
- Boil noodles according to the package instructions. Drain and set aside.
**Cook the Ground Beef:**
- Heat a large skillet or wok over medium-high heat. Add the ground beef and cook, breaking it into small pieces, until browned and cooked through. Drain excess fat if needed.
**Add Garlic and Ginger:**
- Stir in minced garlic and grated ginger. Cook for 1 minute until fragrant.
**Make the Sauce:**
- In a small bowl, whisk together soy sauce, brown sugar, hoisin sauce, sesame oil, and beef broth. Pour the sauce into the skillet with the beef, stirring to combine.
**Thicken the Sauce:**
- Add the cornstarch slurry to the skillet. Simmer for 2-3 minutes until the sauce thickens slightly.
**Combine with Noodles:**
- Add the cooked noodles to the skillet and toss to coat evenly in the sauce. If using vegetables, sauté them separately with a bit of oil and add them in at this stage.
**Garnish and Serve:**
- Sprinkle with sliced green onions and serve immediately.