excerpts:
Reilly and her team settled on what would be first known as “the Green Bean Bake,” an easily adaptable six-ingredient recipe of green beans, cream of mushroom soup, milk, soy sauce, black pepper and French fried onions that takes 10 minutes to prep and 30 minutes to bake.
…
Reilly found success with a tuna noodle casserole, a tomato soup cake and a Sloppy Joe made from tomato soup.
…Campbell’s has estimated that 40 percent of its cream of mushroom soup sold in the U.S. goes toward making Reilly’s green bean casserole. And millions of Americans have adopted it as part of their Thanksgiving celebrations.
“Thanksgiving is the Super Bowl for green bean casserole,” Jane Freiman, director of Campbell’s Consumer Test Kitchen, told NBC’s “Today” in 2015.