This is one of my all-time favorite casseroles. I haven't posted it before because I assumed someone would have already posted it. I was looking for something else and came across a similar recipe, but not the same. So I decided to post this before it gets lost. Addendum: I hadn't made this in awhile until tonight. Because I am trying to lose weight I cooked the vegetables in a covered pan sprayed with PAM and omitted the butter. It turned out just fine. I also added some cubed cooked chicken to make this more of a complete dish. So that is another option with this very versatile casserole.