In a large bowl, sift together flour, baking soda, and salt. Use a food processor to blend graham crackers into fine crumbs. (It equals to ¾ of a packet of graham crackers.) Mix the graham cracker crumbs with the dry ingredients.
Use a mixer and beat butter, brown sugar, and sugar. Beat on medium for 2 minutes until the butter is light and fluffy. Add in vanilla and mix until combined.
Add in egg and egg yolk one at a time. Mix until combined. Scrape the bowl and mix again until the butter is combined. Slowly add in the dry ingredients. Mix until combined
Chill the dough for 30 minutes. Preheat oven to 350°F. Place parchment paper on 2 cookie sheets. Use a cookie scoop (1 ½ TBSP) to scoop the dough. Place the dough about 2 inches apart on the cookie sheet.
Bake 8-10 minutes. The cookie edges will be lightly golden brown. Immediately place a half of a jumbo marshmallow on top of the cookie. Let it cool on cookie sheet for 4 minutes. Then, transfer to cooling rack.
Allow the cookies to cool completely. Turn the oven to broil on high. Place cookies back on one cookie sheet with parchment paper. Broil for 1-2 minutes until marshmallows are golden in color. Watch these like a hawk, they can burn very quickly.
If you have a kitchen torch, use it to give the marshmallows a campfire taste. While the marshmallows are hot, place the Hershey's kiss on top. The marshmallow will crack.