01 - Place beef stew meat cubes in the bottom of the slow cooker.
02 - Layer carrots, celery, potatoes, onion, and garlic over the beef.
03 - Add beef broth, diced tomatoes with juice, tomato paste, Worcestershire sauce, salt, pepper, thyme, rosemary, and bay leaves. Stir gently to combine.
04 - Cover and cook on LOW for 8 hours or HIGH for 4-5 hours until beef is fork-tender and vegetables are cooked through.
05 - Stir in frozen peas during the last 20 minutes of cooking time.
06 - For thicker consistency, stir in cornstarch slurry, cover, and cook on HIGH for 15-20 minutes until stew thickens.
07 - Discard bay leaves, adjust seasoning to taste, and serve hot.