Preheat the oven to 400° F. Line two baking sheets with parchment paper and set aside.
Slice the salted butter into small, ¼ inch cubes. Add the cubed butter to a standing mixer, along with the light brown sugar and the cane sugar. Mix on medium speed for about 4-5 minutes, until there aren't any chunks of butter and the mixture is smooth.
1 cup cold salted butter, sliced in ¼ inch cubes, 1 ¼ cup light brown sugar, packed, ½ cup cane sugar
In a separate bowl, whisk together the all purpose flour, graham cracker crumbs*, sea salt, cornstarch, and baking soda. Set aside.
2 ¼ cup all purpose flour, 1 cup graham cracker crumbs* (about 9 large crackers), 1 teaspoon fine sea salt, 2 teaspoon cornstarch, 1 teaspoon baking soda
Add the eggs and the vanilla extract to the standing mixer, then mix on medium speed until smooth (about 2 minutes). Scrape down the sides of the bowl halfway through to get an even mix.
2 large eggs, 1 tablespoon vanilla extract
Add the whisked dry ingredients to the standing mixer, and mix on the slowest speed. Before the dry ingredients are completely mixed in, add the milk chocolate chips. Stop the standing mixer as soon as the flour has been incorporated in to prevent overmixing.
2 cup milk chocolate chips (I prefer Ghirardelli)
Break the graham crackers in half, creating 12 squares. Place 6 on each baking sheet.
6 large graham crackers
Divide the cookie dough into 12 even balls. Take each individual ball of cookie dough, and flatten it into a disk. Place a marshmallow at the center, and bring up the sides, remaking the dough into a ball shape. Don't worry about sealing the top completely--it's okay if a small bit of the marshmallow is visible.**
12 marshmallows (the size used for campfire s'mores)
Place each ball of cookie dough (with marshmallow inside) on the center of each graham cracker square on the baking sheet. Press down slightly, covering the graham crackers.
Bake each baking sheet individually, for about 10-12 minutes each. Feel free to round out the edges of each cookie using either a round cookie cutter or a spoon when they come out of the oven.***
While the cookies are still warm, press a piece of Hershey's chocolate into the center of each. Let the cookies cool completely before eating.Enjoy! 1 XL Hershey's chocolate bar (only need 12 pieces)