Spread beef stew meat into bottom of slow cooker crock; season with salt and pepper. Layer onion over the beef. Pour mushroom soup and water over the beef; add chives, garlic, Worcestershire sauce, and beef bouillon.
Whisk red wine, cornstarch, and flour together in a small bowl; pour over the mixture in the slow cooker.
Cook on Low for 6 to 7 hours. Stir sour cream, mushrooms, cream cheese, and parsley into the beef mixture; continue cooking for 1 hour more.
