Peanut Butter Popcorn

2 bags popped popcorn
1/2 cup marg.
3/4 cup brown sugar
1/4 cup peanut butter
20 lrg marshmallows

Pour popcorn into lrg bowl. Melt butter, add brown sugar and marshmallows, stir until melted and smooth. Remove from heat and stir in Peanut butter until well blended. Pour over popcorn and stir quickly to coat.