Marshmellow Caramel Popcorn

MmMhmm gloopy goodness. The other night Katie and I had a Bachelorette night accompanied by this delicious snack. We didn't even have to make it!! conveniently, I have an awesome brother-in-law who magically makes things like this appear. He followed the following recipe, but made twice the amount (2 bags) of  popcorn to spread out the yumminess a bit. It sure makes a lot of popcorn but somehow we took care of it all!
Recipe from Pinterest:
1/2 c. brown sugar
 1/2 c. butter
 9-10 marshmallows
 12 c. popcorn.
 Microwave brown sugar and butter for 2 minutes. Add marshmallows. Microwave until melted, 1 1/2 to 2 minutes. Pour over popcorn.