Slow Cooker Tuna-Stuffed Pasta Shells

These gorgeous-looking shells are stuffed with a creamy tuna mix and topped with gooey cheese. There's no need to par-cook your pasta; hours of resting on top of a bubbling tomato sauce will take care of that for you. We find it's easier to refrigerate both the ready-prepped sauce and the tuna-cheese filling (in separate containers!) overnight, then you can fill your shells in record time when you're ready to cook. Set it and forget it until it's time to lift the lid and sprinkle the cheese on top – you won't have long to wait, it'll melt in minutes!