Cook noodles according to package directions, drain, and set aside.
Toss steak slices with soy sauce and cornstarch; let sit for .
Heat olive oil in a skillet over high heat. Sear steak for per side. Remove and set aside.
Reduce heat to medium and add butter. Stir in garlic, brown sugar, red pepper flakes, and beef broth. Simmer for .
Toss in cooked noodles and steak, mixing well.
Garnish with green onions and serve hot!
