Cook steak in large skillet on high heat 2 min. on each side or until browned on both sides.
Remove from skillet; cover to keep warm.
Add margarine and onions to skillet; cook on medium heat 5 min. or until onions are crisp-tender, stirring occasionally. Stir in mushrooms, bay leaves and thyme; cook 10 min., stirring occasionally.
Add broth; bring to boil. Simmer on low heat 3 min. or until slightly thickened.
Add cream cheese spread; cook until melted, stirring frequently.
Remove and discard bay leaves.
Cut steak across the grain into thin slices.
Add to skillet; cook 3 to 5 min. or until meat is done. Stir in parsley.