Cook the diced bacon in a large skillet over medium heat until crisp. Remove the bacon with a slotted spoon and set it aside, leaving the fat in the pan.
Add the beef chunks to the skillet and brown on all sides in the bacon fat. Transfer the beef to the slow cooker.
Place the quartered mushrooms, diced onion, sliced carrots, and minced garlic into the slow cooker with the beef.
Add the cooked bacon, red wine, beef broth, tomato paste, dried thyme, and bay leaves to the slow cooker. Stir to combine everything evenly.
Season with salt and black pepper. Cover and cook on low for 8 hours until the beef is fork-tender.
Remove the bay leaves before serving. Sprinkle with chopped fresh parsley.