Bring a large pot of salted water to a boil. Cook the noodles according to package instructions until al dente. Drain and set aside.

In a large skillet over medium-high heat, cook the ground beef until browned and fully cooked. Drain excess grease if needed.

Add minced garlic and grated ginger to the skillet and cook for about 30 seconds until fragrant.

In a bowl, whisk together soy sauce, beef broth, brown sugar, and hoisin sauce. In a separate small bowl, mix cornstarch with water.

Pour the sauce mixture into the skillet and bring to a gentle simmer. Stir in the cornstarch slurry and cook until the sauce thickens.

Add the cooked noodles to the skillet and toss until evenly coated in the sauce. Drizzle with sesame oil and garnish with sliced green onions and red pepper flakes before serving.