Caramel Popcorn Marshmallow Treats

Makes 16 large squares or 24 small ones

10 cups popped unflavored popcorn (from 1/4 cup kernels or 1 microwave bags)
1/2 cup dark brown sugar
6 tablespoons salted margarine (add a healthy pinch of salt if using unsalted)
10 oz marshmallows (5 cups mini marshmallows)
1 cup salted peanuts, coarsely chopped

Grease a 9 x 13 baking pan. Sort the popcorn to make sure there are no un-popped kernels. Combine the sugar and margarine in a large microwaveable bowl. Microwave for one minute or until margarine is melted. Stir to combine. Add the marshmallows and microwave 1-2 minutes more until melted. Stir well to combine. Stir in the popcorn and the peanuts. Scrape the mixture into the prepared pan and press down evenly with on oiled spatula (or clean oiled hands). Let cool and then cut into bars. If making balls, let the mixture cool slightly in the bowl and then shape into balls.