Add the cubed beef and chopped bacon to the slow cooker.
Pour in the beef broth and red wine.
Add the quartered mushrooms, diced onion, sliced carrots, thyme sprigs, minced garlic, tomato paste, salt, and pepper.
Stir everything gently until the tomato paste is mostly distributed.
Cover and cook on low for 8 hours.
Remove the thyme stems before serving.