Cook noodles as directed on package. Drain.
Meanwhile, in medium bowl, combine soy sauce, garlic and beef strips; toss to coat. Heat oil in wok or 12-inch skillet over medium-high heat until hot. Add beef mixture; cook and stir 5 to 6 minutes or until beef is no longer pink in center.
In medium bowl, mix broth, cornstarch, oyster sauce and gingerroot until smooth. Add to wok; cook and stir 2 to 3 minutes or until sauce has thickened. Gently fold spinach into beef mixture; cook and stir 2 to 3 minutes or until spinach is slightly wilted.
In large serving bowl, combine cooked noodles and beef mixture; toss gently to coat.