Twist one Oreo® so that the top and bottom are separated. Double-stuffed Oreos® are the only way to go.
Face the filled side up, and put the chocolate squares on top. Then layer the marshmallow on top. Put aside the top half of the Oreo® for after.
Now this next step is completely up to you… You can now place the top half of the Oreo® on top and place the S’mOreo inside a microwave and warm up for a few seconds. OR!!! You can do what I did and keep the top part off for the moment place the Oreo® with the chocolate and marshmallow in the oven and broil it for a few minutes so that you get that campfire smoky flavor. COMPLETELY up to you.
If you chose the oven way take melted chocolate and marshmallow goodness out and top with top Oreo®.