I have made this more than once and let me tell you, I get rave reviews from the people I share it with. I personally like making this with a simple mozzarella filled ravioli vs any other so far. Just a texture thing for me. Simple to put together with store bought ingredients. I usually make it in smaller pans and share them with friends to bake when they are ready, so honestly, using frozen ravioli isn't that important of a step in my opinion. Ravioli I prefer is Rana brand in the refrigerated section of my Kroger.