Mayonnaise cake draws its name by using mayo instead of eggs and butter or oil in the cake batter. Since mayonnaise consists mostly of eggs and oil, it works great as a substitute for those ingredients typically found in cake recipes. It became a popular dessert dish during the Great Depression when families were forced to find more economical ways to recreate their favorite foods when they were unable to afford or find more expensive ingredients like eggs, milk, and butter. It continues to be a popular Southern comfort food today as well as a great choice for families looking for a rich dessert on a budget.