Spray 6- to 7-quart slow cooker with cooking spray. Generously sprinkle all sides of beef with salt and pepper. Place beef in slow cooker.
Arrange mushrooms, potatoes and carrots around beef. Pour cooking sauce over beef and vegetables.
Cover; cook on Low heat setting 6 to 8 hours or until beef is tender.
Serve beef and vegetables with sauce from slow cooker. Garnish with parsley.