I just made this after seeing this! Make sure the mug is large enough, as the cake will rise past the top of the mug like one of those cheap 4th of july “snake” fireworks. It was tasty, but very rich and more than enough for one person. I would suggest using hot chocolate mix if you don't have cocoa powder, like I did, but even then use closer to 6 tablespoons of it. This was painfully easy to make. I'll definitely be making this again!!