I substituted peanut butter cups for the standard milk chocolate. What a great flavor! The peanut butter tamed the sweetness from the marshmallows. Peanut butter lovers, this is the s'more for you!
We don't have anywhere to roast marshmallows here at the beach house. That took a bit of the fun out of getting the marshmallow toasted. I used the oven instead and it worked like a charm. The best part of using the oven was getting the peanut butter cups warm and melty under the broiler making it blend really well with the marshmallow.
Chocolate takes WAY less time to melt than the marshmallow. Wait until the last few seconds to put the chocolate under the broiler. In fact, this whole melting process takes only a minute or two. Leave the oven light on and don't walk away from it!