My guess, mac and cheese. Definitely a staple of mine during the lean college years.
https://livinghistoryfarm.org/farminginthe30s/life_04.html
"During the Depression, this self-sufficiency carried over into their social life. One-dish suppers and church potlucks were important ways to have fun and share food. On radio and in women's magazines, home economists taught women how to stretch their food budget with casseroles and meals like creamed chipped beef on toast or waffles. Chili, macaroni and cheese, soups, and creamed chicken on biscuits were popular meals."
