Add the cooked bacon, uncooked stew beef, carrots, yellow potatoes, mushrooms, and pearl onions to your slow cooker.
Whisk together the wine, beef broth, tomato paste, sugar, beef bouillon cube, Worcestershire sauce, garlic, and cornstarch.
Add the liquid to the slow cooker, cover, and cook on low for 6-8 hours or high for 4-6 hours until the beef and veggies are tender.
Garnish with parsley and serve!