Cook the Noodles:
Cook the noodles according to the package instructions. Drain and set aside.

Cook the Beef:
In a large skillet or wok, heat vegetable oil over medium-high heat. Add the ground beef and cook until browned, breaking it apart with a spoon.

Add Garlic and Ginger:
Once the beef is cooked through, add the minced garlic and grated ginger to the skillet. Cook for an additional 1-2 minutes until fragrant.

Make the Sauce:
In a small bowl, whisk together the soy sauce, hoisin sauce, brown sugar, and water. If you prefer a thicker sauce, mix the cornstarch with a little water to create a slurry, and add it to the sauce mixture.

Combine Sauce and Beef:
Pour the sauce over the beef mixture and stir to coat. Bring to a simmer and cook for 3-4 minutes, allowing the sauce to thicken.

Add Noodles:
Add the cooked noodles to the skillet and toss to combine, ensuring the noodles are evenly coated in the sauce.

Garnish and Serve:
Remove from heat and sprinkle with red pepper flakes (if using), chopped green onions, and sesame seeds. Serve warm and enjoy!