Combine Beef, carrots and onion in the slow cooker
In a small bowl, combine flour, marjoram. garlic powder, and pepper. With wire whisk, stir in broth, wine and Worcestershire sauce until smooth. Add to the beef mixture in slow cooker, stir to combine.
Cover and cook on hight for 1 hour
Reduce heat to low and cook an additional 6 hours
About 45 minutes before serving, add mushrooms to beef mixture.
Cook noodles as directed on package. Serve beef mixture ever noodles. Sprinkle with parsley.