It is advised not to pop popcorn in a paper bag in the microwave, it can start a fire :wink:
Here is a link to cooking a turkey in a paper bag
http://www.food.com/recipe/cooking-a...-in-a-bag-4807
However, there seems to be some concern over the materials used in paper bags, being safe for this method
http://urbanext.illinois.edu/turkey/brown.cfm
I prefer to use the bags made for turkeys. I cut off the top of the bag towards the end, to allow for more browning :D:D:D