Place the beef stew meat in the bottom of the slow cooker.
Add the sliced carrots, chopped celery, diced onion, and halved mushrooms on top of the beef.
Sprinkle the minced garlic, Herbs de Provence, salt, and black pepper over the vegetables and meat.
Pour the beef broth into the slow cooker and tuck the bay leaves into the liquid.
Cover and cook on low for 8 hours, until the beef is fork-tender.
Remove the bay leaves before serving.