Slow Cooker Ravioli Lasagna Recommended Product: BLACK+DECKER WiFi Slow Cooker. Prep Time: 10 min Cook Time: 4 hr Ready In: 4 hr 10 min Serves: 5 Ingredients: 1 (25oz) bag Frozen Ravioli (choose your favorite filling) 2 (24oz) Jars Meat Pasta Sauce 4 Cups Shredded Mozzarella Directions: Grease the slow cooker with cooking spray and pour 1 cup pasta sauce into the bottom. Place one layer of ravioli on the sauce and top with 1 cup of cheese. Repeat with three more layers and top with any remaining sauce. Place the lid on the slow cooker and cook for 4 hours on low, or until ravioli is cooked through and cheese is melted. Serve with breadsticks.