Heat gas or charcoal grill. On each of 4 (15-inch) metal skewers*, alternately thread steak, mushroom and bell pepper. In small bowl, mix cooking sauce and steak seasoning.
Place kabobs on grill over medium heat. Cover grill; cook 12 to 14 minutes or until beef is of desired doneness, turning once and brushing frequently with cooking sauce mixture.
Heat remaining cooking sauce mixture to boiling; boil 1 minute, stirring frequently. Serve kabobs with remaining sauce. Sprinkle with parsley.