Lay out a soft shell tortilla and spread peanut butter on the middle half or so.  Add three large marshmallows and sprinkle a few chocolate chips over the top.  

Roll the tortilla shell with the ingredients in it so it resembles a tube, then wrap the entire thing in a single layer of aluminum foil.

Set the wrapped tortilla in the fire or on the coals.  Let it sit for a few minutes, but turn it occasionally so it bakes evenly.

When you're all done, you have a glorified S'more that's pretty darn tasty!