Yellow cake is a type of cake that gets its golden hue from egg yolks, which are used whole rather than separated egg whites, making the cake rich and tender. The fat in yellow cake is usually all butter, which also enhances the sunny shade and gives the cake a mild custard flavor that holds up exceptionally well to chocolate or cream cheese frostings. Most people describe the flavor of yellow cake as vanilla, but it has a deeper, richer flavor than white cake, which is also vanilla-flavored but much subtler. The key to yellow cakes flavor is the fat content from the egg yolks and butter, which enhances the vibrant color and gives the cake a custardy richness that lingers on the palate. Therefore, yellow cake has a mild custard flavor that is enhanced by the use of butter and egg yolks, making it different from white cake, which uses only egg whites.