This just takes cookies and cream that one step further. Oreo upside down cake! I made this as a birthday cake for another colleague, and I had it in my head that I needed make a cookies and cream cake, with fresh cream. I thought that with the thick layer of cream in the middle, covering the whole thing in buttercream too would be just a bit too much (if there is such a thing), so to make the top look a little more interesting, I decided to try making an upside down cake with whole Oreos. It's not as tidy as I was hoping, as the cake batter got under some of the cookies, but it still looks, and smells, pretty good!