To make the cookie dough- Whisk the flour, baking soda, and
salt together in a medium bowl; set aside. In the bowl of a stand
mixer fitted with the paddle attachment, or by hand, mix butter
and sugars until thoroughly combined. Beat in the egg, yolk, and
vanilla until combined. Add dry ingredients and beat at low-
speed just until combined - the batter should look a little lumpy.
Stir in chocolate chips.
Preheat oven to 325° F. Line two baking sheets with parchment
To assemble and bake- Lay half of the graham crackers out on
the baking sheets - two crackers per sheet. Top each cracker
with 3-4 pieces of chocolate then top the chocolate with two
marshmallow halves, laying them side-by-side. Lay the
remaining graham crackers on top of the assemble s'mores.
Sandwich the s'mores between two large spoonfuls of cookie
dough and using the remaining dough to wrap around each of
the s'mores; the result should resemble a small cookie brick.