Marble cake was one of the first cakes that I ever learned how to make, this is an adult version of the easy cake I made in brownies. I don't remember where I got this recipe from, it was on a hand written card in one of my cookbooks. I have been making this cake for at least 5 years. This cake gets better after it has sat for a day or two, so make in advance of occasion for best results. Store in an airtight container.