According to Wikipedia, this classic Thanksgiving side comes from the kitchen of Dorcas Reilly—a home economist working for Campbell’s test kitchen—in 1955. Reilly created this dish hoping to make a simple, accessible recipe for Americans using ingredients many had on hand—namely, canned green beans and cream of mushroom soup. Though the original recipe called for a mixture of cooked green beans, cream of mushroom soup, seasonings, and crispy fried onions, many have since adapted this dish to meet their own dietary needs, taste preferences, and available ingredients, leading to this recipe for homemade green bean casserole no soup.