Add the beef stew meat to the slow cooker.
Place the onion, carrots, zucchini, and garlic on top of the meat.
Pour in the diced tomatoes and beef broth.
Sprinkle the Italian herb seasoning, salt, and black pepper over everything.
Stir gently to combine the ingredients.
Cover and cook on low for 7 to 8 hours until the beef is tender.
Stir in the frozen peas during the final 30 minutes of cooking.