The green bean casserole has become a staple of Thanksgiving dinners that is beloved by millions of Americans. That’s why the nation is in mourning today after the death of Dorcas Reilly, who invented the dish. She passed away last month from Alzheimer’s disease at the age of 92.

Campbell Soup officials confirmed that Dorcas had come up with the dish, which is made with green beans and cream of mushroom soup topped with crunchy fried onions. They added that it is the most popular recipe that the company has ever offered, and the original recipe card was to the National Inventors Hall of Fame in 2002.

“Dorcas was an incredible woman, whose legacy will live on for years to come. She will be missed by her Campbell colleagues and all those who were impacted by her creativity and generous spirit,” Campbell’s Soup said in a statement.

Dorcas was working as a Campbell Soup kitchen supervisor in 1955 when she started experimenting with the ingredients and ended up with the tasty dish. She later said that she could not specifically remember making the dish for the first time because she had her hand in hundreds of dish recipes. Dorcas explained that the green bean casserole dish was so popular that she always kept it on hand in her own kitchen at home, just in case anyone wanted her to whip it up!

She worked for Campbell’s from the 1940s until she retired in 1988.

Dorcas is survived by Thomas, her husband of 59 years, and their two children.