Place the beef stew meat, sliced mushrooms, diced onion, and minced garlic in the slow cooker.
Add the beef broth, Worcestershire sauce, paprika, salt, and black pepper. Stir to combine.
Cover and cook on low for 7 to 8 hours until the beef is tender.
About 15 minutes before serving, cook the egg noodles in a pot of boiling water according to package directions. Drain well.
Stir the sour cream into the slow cooker until the sauce is smooth.
Spoon the beef and sauce over the cooked egg noodles. Sprinkle with chopped parsley before serving.