Place your oven rack on the lowest level of the oven. This is important! We’re using the broiler, and placing it on the lowest rack gives the marshmallows and chocolate a minute or two to toast and melt before burning.

Preheat the broiler in your oven to high. Place 12 graham crackers on a sheet pan. Top each with a piece of chocolate or a peanut butter cup. Top each with a marshmallow.

Place the sheet pan in the oven for 1 to 3 minutes - keeping your eye on it the whole time. This will all depend on your broiler! You want the marshmallows puffed and golden brown on top.

Remove the pan from the oven and top with the remaining graham crackers. Serve immediately.