Hotdish.
You guys probably call it a casserole.
http://en.wikipedia.org/wiki/Hotdish
My mom's personal variant on this was:
Ground turkey & Cream Of Mushroom Soup cooked in glass with chow mein noodles on top.
I'm pretty sure "hotdish" is the most ridiculous and parodied Minnesotan/Midwestern food item.
However, it does get weirder.
A dessert at family functions (and this is common in this area):
white rice w/whipped cream and canned fruit cocktail, served cold.
I'm not kidding.