Made this for a holiday dinner but this is great all year round. I made a few changes: 1) tossed the squash and zucchini in olive oil and pepper, then broiled versus boiling; 2) added pimentos for color; 3) agree with other posters on corn - I used frozen since fresh was out of season; 4) used garlic roasted bread crumbs.
This is absolutely delicious! My family, kids included love it. I follow the recipe exactly with the exception of adding more breadcrumbs to the top, just because my family loves it, not that the recipe needs to be adjusted. Since it is rich and creamy, we pair it with a simple grilled chicken like Lexington-style Grilled Chicken also found on the SL site.