Ingredients:

1/2 cup KRAFT LIGHT DONE RIGHT! Zesty Italian Reduced Fat Dressing, divided
1 pound well-trimmed boneless beef sirloin steak
1/3 cup BREAKSTONE'S FREE or KNUDSEN FREE Fat Free Sour Cream
4 1/2 teaspoons KRAFT 100% Grated Parmesan Cheese
1/4 teaspoon black pepper
1 cup thinly sliced onions

Method:

Pour 1/4 cup of the dressing over steak in resealable plastic bag. Seal bag; turn to coat. Refrigerate 30 min. or overnight to marinate. Combine sour cream, 2 Tbsp. of the remaining dressing, the Parmesan cheese and pepper. Refrigerate until serving time.

Heat remaining 2 Tbsp. dressing in large nonstick skillet on medium heat. Add onions; cook 7 to 8 min. or until golden brown, stirring frequently. Remove onions; set aside.

Drain steak; discard marinade. Cook steak in same skillet on medium heat 3 to 4 min. on each side for medium doneness. Place on cutting board; slice crosswise into thin strips. Serve steak topped with sauce and onions.