This Slow Cooker Baked Ziti is an easy, comforting pasta dinner made with ground beef, onion, garlic, tomatoes, marinara sauce, and Italian herbs. The pasta cooks in a flavorful tomato broth right in the slow cooker, then gets topped with mozzarella for a delicious, cheesy finish. It is a convenient family-friendly meal with classic baked ziti flavor and minimal cleanup.