Place the beef stew meat in the bottom of the slow cooker.
Add the diced onion, sliced carrots, and minced garlic on top of the meat.
Pour both cans of diced tomatoes and the beef broth over the vegetables.
Sprinkle in the Italian seasoning, salt, and black pepper.
Stir everything gently to distribute the seasonings.
Cover and cook on low for 8 hours until the beef is fork-tender.
Stir in the drained white beans during the last 30 minutes of cooking so they warm through without breaking apart.