Chocolate Mayonnaise Cake is a beloved American dessert that rose to popularity during the Great Depression and World War II, when eggs and butter were scarce. Home bakers found mayonnaise, a combination of eggs and oil, to be a clever substitute that kept cakes moist and tender. This recipe reflects the resourcefulness of that era, transforming pantry staples into a decadent treat. Its simplicity, rich chocolate flavor, and incredibly soft texture have helped it stand the test of time. Whether served plain or frosted, it remains a nostalgic favorite across generations.