O. M. G. Best mac and cheese ever. I omitted the spinach, and I used half shredded mozzarella and half shredded cheddar since that's all I had. I added a few good shakes of garlic powder and some Mrs. Dash. I also used panko bread crumbs and whole wheat rotini. Seriously, it was DELICIOUS. My picky fiance and pickier 14-year-old brother both raved over it. Next time I think I'll double the recipe cause it was gobbled up fast! I also would like to try it with a broccoli layer.