Make your brownie mix and put it in the muffin tins.
Then just some cherry pie filling overtop when ready to serve.
For a little more WOW-power, I'd put a dollop of whipped cream (or cool whip) on the mini brownie first.
Then top with a drizzle of cherry pie filling ... hopefully with a cherry!
(I'd buy extra frozen cherries, and cook them a little, then turn into the pie filling so you could be sure to have atleast one cherry per person ... or make the filling from scratch)