You can use any veggies in the sauté you like. I added ground turkey but this is fantastic without meat. You can make this one a day ahead and it store well in the refrigerator. For a smaller bake, you can do one round of layers which will yield a thinner bake and it will heat faster. I have also doubled this for large gatherings and it works well in two 9x13 pans. If it requires a little extra time in the oven to heat through, that is okay, though you may want to tent the top with foil if cheese starts to brown.