Green bean casserole is a pretty popular Thanksgiving Day side dish in the United States. It consists of green beans, cream of mushroom soup, and french fried onions.
This dish was actually made by the Campbell Soup Company in 1955, probably a telling clue as to why Campbell's Cream of Mushroom Soup is a main ingredient.
Dorcas Reilly led the team that created the recipe while working as a staff member in the home economics department.
The inspiration for the dish was "to create a quick and easy recipe around two things most Americans always had on hand in the 1950s: green beans and Campbell's Cream of Mushroom Soup."
The original recipe card is now found in the National Investors Hall of Fame in Akron, Ohio.