Season the beef chunks with salt and pepper. For extra flavor, sear the beef in a skillet over medium-high heat until browned on all sides (optional).
Place the beef, beef broth, Worcestershire sauce, carrots, celery, onion, garlic, and seasonings (thyme, parsley, black pepper, and salt) into the crockpot. Add diced tomatoes if desired.
Cover and cook on low for 7-8 hours or on high for 4-5 hours, until the beef is tender and the vegetables are soft.
About 20-30 minutes before serving, stir in the egg noodles. Cover and cook until the noodles are tender.
Taste and adjust seasoning if needed. Serve the soup hot, garnished with fresh parsley. Enjoy!