Light and tasty! This is the perfect Summer Casserole! When baked, the topping becomes a crunchy cheese crisp…..ADDICTING! I made this casserole last night and it was SO GOOD I had to have seconds! My Husband loved it…..my KIDS ate ALL of their helpings! I wish I had more squash and zucchini so I could make another casserole for dinner again tonight! This recipe is lighter and better for your waistline than the typical Southern staple. There is no sour cream nor any cream of mushroom/chicken…..trust me when I say….It is just as good, if not BETTER! Y’all have GOT TO TRY THIS! Start by preheating your oven to 400°F…