Slow Cooker Ravioli Lasagna

"This tasty, easy slow cooker ravioli lasagna combines frozen or fresh ravioli with onions, mushrooms, marinara, and melted mozzarella. Assemble the dish the evening before and store it covered in the refrigerator. This tasty and easy slow cooker ravioli lasagna combines frozen or fresh ravioli with onions, mushrooms, marinara, and melted mozzarella cheese. This is a great slow cooker recipe for busy families and hungry appetites. Enjoy this dish with fresh homemade bread or rolls and a simple salad."