Slow Cooker Cheesy Ravioli Casserole I tried this recipe yesterday and found it wasn't a bad dish at all. It was a bit drier than what we like, as saucy Italian dishes are Our favorite. I cooked on low for the maximum time allowed. Shortening the cook time by a couple I hours (if possible) would Be good. Could use a little more seasoning, not sure what. Overall I would make this again.