You need oreos (Like always I got double stuffed), marshmallows (we found flat ones), and chocolate bars. I started by turning my oven to broil and lining a cookie sheet with foil to catch any mess. Then I un-twisted my oreos and placed the side without cream filling on the cookie sheet.
Then add a marshmallow on top of each cookie. The flat ones worked well even though I really wanted round ones since oreos are round. I think if you took a big round one and cut it in half to make shorter round ones they would be perfect.
Place these on the top rack of your oven for just a little bit. Seriously don't leave the kitchen unless you want burnt marshmallows. We started placing the chocolate on the other side of the cookie while the marshmallows got toasty.
Watch the marshmallows closely, so you get the perfect degree of toastiness for you; then pull them out.
Immediately top with chocolate and cream side of cookie. Allow to set a few moments for it all to melt together and cool just a bit. Then enjoy!