Cut steak into four serving-size pieces. Sprinkle with garlic pepper.
In a 10-inch skillet cook steaks in hot margarine or butter over medium heat for 8 to 10 minutes or to desired doneness (145 degrees F for medium doneness), turning once. Remove steaks from pan; cover and keep warm.
For mushroom glaze, carefully add beef broth and hoisin, teriyaki, or Worcestershire sauce to skillet. Cook and stir until bubbly, scraping brown bits from the bottom of the pan. Stir in onion wedges and sliced mushrooms.
Cook over medium-high heat about 8 minutes or until vegetables are tender and the glaze is reduced by half its volume (to 1 cup). Transfer warm steak to dinner plates and spoon glaze atop.