This Easy 4-Ingredient Slow Cooker Ravioli Lasagna is a fuss-free, delicious comfort meal perfect for busy days. Featuring layers of savory ground beef, rich pasta sauce, cheesy spinach and cheese ravioli, and melty mozzarella, this recipe uses the slow cooker to create a hearty, hands-off dinner that tastes like traditional lasagna without the effort of assembling noodles.