Garlic Steak & Onions

1 boneless beef sirloin steak (1 lb.)
1/2 teaspoon freshly ground black pepper
2 teaspoons minced garlic
1 large onion, cut into thin slices
1/4 cup sun-dried tomato dressing
2 Tablespoons Parmesan cheese

Heat large skillet sprayed with cooking spray on medium heat. Add steak; sprinkle with pepper. Cool steak 5-6 mins. on each side or until medium doneness. Remove from skillet, reserve drippings in skillet. Place steak on cutting board, cover loosely with foil. Add onions and garlic to skillet. Stir in dressing; cover with lid. Cook 5 mins.; stir. Cook an additional 4-5 mins. or until onions are tender, stirring occasionally. Meanwhile, cut steak across grain into thin slices; place on serving platter. Top steak with onion mix. Sprinkle with cheese