1. Trim fat from steak. Combine soy sauce and next 4 ingredients in a large heavy-duty zip-top plastic bag. Add steak; seal bag, and shake until steak is well coated. Marinate in refrigerator 8 hours, turning bag occasionally.
2. Remove steak from marinade, reserving marinade. Cut steak diagonally across grain into 1/4-inch-thick strips.
3. Heat oil in a large nonstick skillet coated with cooking spray over medium-high heat. Add steak; cook 5 to 6 minutes or until browned on all sides, stirring frequently. Remove steak from pan. Drain and pat dry with paper towels. Wipe drippings from pan with a paper towel.
4. Coat pan with cooking spray; place over medium-high heat until hot. Add mushrooms; sauté 3 minutes. Stir in reserved marinade and parsley. Cover, reduce heat to medium, and cook 5 minutes. Return steak to pan; cook until thoroughly heated.
carbo rating: 4