Very simple. I realize Joe Richie posted his comment in 2014. A that if yound maybe the recipe was revised since then. But, if the recipe says "6 servings", I'd assume that if you made a full recipe you can cut the pie on 6 pieces. Lol
I prefer to make this with corn instead of beans. My family likes it much better. A great last minute meal.
I have made this dish for years. Sometimes I use cr. Of mushroom soup and a drained can of mushrooms instead of the tomato soup. Good either way.