Brownies In A Mug Gone Wrong

So i decided to make brownies in a mug once more but this time i thought it would be cool if i used my own mug as its more cylinder like than my other mugs well lets say i instantly regret that as it doesn't hold as much as my others, below is a pic of what happened

Note to self never use that mug again, it did still taste pretty awesome but then it ruined my mug and it took my 5 minutes to clean it as it pretty much turned to stone as it got cooked too much, but is still tasted really good.

Next thing to try it in is a bowl.