2 cups plus 2 tbsp all-purpose flour
½ tsp baking soda
½ tsp salt
12 tbsp unsalted butter, melted and cooled until warm
1 cup brown sugar, packed
½ cup granulated sugar
1 large egg plus 1 egg yolk
2 tsp vanilla extract
1 ½ cups semi-sweet chocolate chips

For assembly:

1 cookie dough recipe, at room temperature
8 graham cracker squares, broken into halves (see header note above)
4 marshmallows, snipped in half lengthwise
1 full-size Hershey’s bar, divided between each of the prospective cookies