My mother has made this dish for many years.
Our philosophy is that anything tastes good with sauce and cheese on it.
I know the baking time seems long, however, I don't saute my zucchini or other veggies to keep the fat low and just to make life easier.
So therefore, this dish needs to bake longer to let the water from the veggies to cook away.
I like to bake in a deep cast iron chicken fryer or dutch oven on the fire while we are camping.