Break graham cracker sheet into two squares. Set aside.
In a small bowl, lightly stir together whipped topping, chocolate chips, and marshmallows. Don't over-stir.
Place one graham cracker square on a plate, and top with whipped-topping mixture. Lightly place the other square on top.
Freeze until solid, about 1 hour. Store in the freezer until ready to serve. Enjoy!
PER SERVING (entire recipe): 133 calories, 2.5g fat, 99mg sodium, 26g carbs, 0.5g fiber, 11.5g sugars, 1g protein