Cook noodles according to package directions.
Drain noodles and set aside.
Heat oil in large skillet over medium-high heat.
Add ground beef to hot skillet.
Cook beef until browned, about 5 minutes.
Add garlic and ginger to beef.
Cook for 30 seconds until fragrant.
Mix soy sauce, brown sugar, and cornstarch.
Pour sauce mixture over beef.
Stir constantly for 2 minutes.
Add cooked noodles to skillet.
Toss everything together for 1 minute.
Garnish with green onions before serving.