The Creme Brulee donut at the Doughnut Plant.
Their website is rather busy, but if you’re quick you can sort of get an idea of what they have available before each donut flavor icon morphs into a different one. Gah, Flash is so overused! I spent most of my time on their site going “Wait, what was that one? What? Where is it? What? Wait, what was the one before?!?!?!?! STOP!!”