So, I found about 200 ideas that I looked at on the web last night. In the process, I learned that a 9 x 13 cake has been done SOOOO many times, that it is boring. I also learned that MMF is MarshMallow Fondant. Now you know. I already like fondant, and am willing to try new, cheaper things, so when I am out of fondant, I will make some MMF. Back to my cake story - I liked one that had two round tiers. So I doubled my usual chocolate cake recipe that fills two 9" round pans and filled two 8" and two 9" pans. I am out of time tonight, so I'll give you the recipe tomorrow.
While these cooled, I made a chocolate fudge icing to be a thick surprise between the layers.
Then I levelled the cakes. I used a long, serrated edged knife as seen here and just "sawed" off the tops. I saved those tops for week-day dessert. I looked at the cuts from eye level to see if they looked level. I trimmed a bit and then filled the layers and stacked them. I cut down the 8" cake to give it straight sides and make it a more noticeably different size of 6 1/2".