1Spray 5- to 6-quart slow cooker with cooking spray.
2Arrange onion, potatoes, carrots and garlic in bottom of slow cooker.
3Place beef over vegetables. Sprinkle with salt and pepper. Pour tomatoes over beef and vegetables.
4Cover; cook on High heat setting 4 to 5 hours, or Low heat setting 6 to 8 hours. Serve beef and vegetables with sauce. Garnish with parsley.