This recipe works best in a 9 x 13" glass dish, however, I've made it in two 9"inch pie plates and also in an 8 x 3½ round casserole dish.  The 9 x 13 x 2" inch casserole dish works best for serving a large group-the batter fills the rectangular pan up about half-way, so that allows each person to get a scoop of the crunchy top and warm filling.