Well, I think my father’s recipe is for round skillet like 10 inches wide and about 2 deep.
I normally imagine it feeds 3 men on a motzei shabbos.
I make a third of the recipe and put it in a 6 inch round, and it feeds one man and one woman on a motzei shabbos. (Or one man and also one man for lunch on sunday.)
If you are making it for a family, I’d say make two, in two skillets at the same time.
You can also use a casserole dish if you don’t have a large skillet. It doesn’t matter if it is round or square.
It is the kind of pizza you eat with a knife and fork, btw.