The broccoli souffle was even better than the sweet potato! Mmm. I used fresh steamed broccoli and topped it with panko bread crumbs drizzled with olive oil for a nice crispy topping. (Crushed corn flakes is another idea that I've been meaning to try.) I've actually made a similar dish before as a casserole - same mix of cream soup, mayo and cheese, with chicken cubes and frozen veggies. It's one of my favourite comfort foods.