Spray 3 1/2- to 4-quart slow cooker with cooking spray. In slow cooker, place carrots; sprinkle with salt, brown sugar and butter.
Cover; cook on High heat setting 4 to 5 hours, stirring after 2 hours, or until carrots are desired tenderness.
Spoon carrots into serving bowl; spoon any sauce from slow cooker over carrots. Season with additional salt and pepper, if desired. Stir before serving. Sprinkle with parsley.