This dish is the ultimate comfort food for me. And the sauce is a little on the lighter side because you may choose to use very little butter or heavy cream. I use skim milk, and find that I don't miss the cream at all. Feel free to experiment with different vegetables layered in this as well. Asparagus and/or artichoke hearts make nice substitutions. For the ravioli, try and find a "family size" package (24-28 oz), or you may use two smaller packages.