Preheat oven to 375.
Melt the butter and place in a shallow bowl.
Combine cinnamon and sugar in a separate shallow bowl.
Unroll the crescent rolls and separate (feel free to get your aggression out banging that ungodly cylinder against the counter a few times to get it to pop open). Place one marshmallow in the center of each roll and wrap up until completely covered. It will look like a little ball when complete.
Roll each ball in the butter and then the cinnamon sugar mixture. Put in muffin tins.
Bake for 12 minutes, or according to Crescent baking instructions.
Let cool slightly (not too much, they're best warm out of the oven) and ENJOY!