You kind of have to play around with what is meant by a "large" bag of broccoli or a "large" box of stuffing. But, I used one regular to small size steamer bag of broccoli and then I took a small amount of cauliflower and cooked it -- then mixed the two until I had enough vegies to cover the bottom of the dish. I suspect that one could use a variety of broccoli, cauliflower and even carrots or other vegetables you had. I have also made a summer skillet vegie dish (tomato, squash, onion pepper, mushroom) all sautéed together and baked it with the stuffing on top -- just until hot (no soup needed). This recipe as given with just the broccoli is a very good basic recipe that lends itself to experimentation.