Boil a large pot of salted water over high heat. Add noodles and cook according to package instructions until al dente, about 8-10 minutes. Drain and toss with vegetable oil.

Heat 1 tablespoon of vegetable oil in a large skillet over medium-high heat. Add ground beef and cook for 5-7 minutes until browned.

Lower heat, add garlic and ginger; sauté for about 1 minute until fragrant.

In a separate bowl, mix soy sauce, brown sugar, and water. Pour over beef and stir to combine. Cook for 2-3 minutes.

Mix cornstarch with a bit of water in a bowl. Pour into skillet while stirring. Cook for 1-2 minutes until thickened.

Add cooked noodles to the skillet and toss with beef and sauce. Heat together for a minute.

Stir in sesame oil and half of the chopped green onions. Garnish with remaining onions before serving.