Doughnut Plant is featuring an Elvis Doughnut, which I tried today. It has a banana cream filling and a peanut-butter coating. I've gotten sick of Doughnut Plant's doughnuts lately, but this concoction was actually quite good. The peanut butter coating was OK, but the banana cream filling was a perfect match consistency-wise for the texture of Doughnut Plant's doughnuts, which I find to be too dry. The Elvis is worth a try.