Heat a large skillet or wok over medium-high heat for about 2 minutes. Add the ground beef, break it up, and cook for 5–7 minutes until browned.

Combine ¼ cup soy sauce, 2 tablespoons brown sugar, 2 minced garlic cloves, and 1 tablespoon grated ginger in a separate bowl. Whisk until the sugar dissolves.

Pour the sauce over the cooked beef in the skillet. Reduce heat to medium-low and let it simmer for 3–4 minutes.

Bring a large pot of salted water to a boil. Add the noodles and cook according to package instructions, typically around 7–9 minutes.

Add the drained noodles to the beef and sauce, tossing gently to coat. Drizzle with 1 tablespoon of sesame oil and stir over medium heat for 2–3 minutes.

Garnish with chopped green onions and serve immediately.