This pie is outrageously delicious! no pastry crust to make for this just use crushed Ritz crackers, this pie is perfect for potlucks or to serve with a main meal, might I suggest to make two, you just might eat one pie yourself lol! If possible use Vidalia onions for this, when I made this pie, I topped it with crumbled bacon, but that is optional. Of coarse fresh sauteed mushroom are better, but canned will do, you can also make this using regular onions in place of sweet onions, just add in a couple teaspoons of sugar when sauteeing them to. Throw in some cooked Italian sausage too...YUMMMMMMM!