Slow Cooker Ravioli Casserole doesn't even actually feature ravioli. Instead, it offers all the flavors of your favorite stuffed pasta, with bowtie pasta to help soak up a deliciously rich, seasoned, slow-cooked tomato sauce with plenty of savory beef. The top is a melty layer of creamy mozzarella and sharp parmesan cheeses, so you get a wonderful cheesy stretch with every bite. Slow Cooker Ravioli Casserole takes a look at traditional ravioli dinner and plays with it, much to the delight of your taste buds.