Preheat oven to 350 degrees F.

In the bowl of a stand mixer using the paddle attachment, beat butter and sugar together. Add vanilla extract and then the eggs, one at a time.

In a separate bowl, combine flour, baking soda, and salt. Whisk together and add to the butter mixture and beat until combined, about 15-20 seconds. Then add 1 1/2 cups of semi-sweet chocolate chips and fold together.

Add half of the dough to the bottom of a cast iron skillet. Top with graham crackers until the bottom layer is covered, about 4-5 sheets. Then add marshmallows to cover the graham crackers. Sprinkle in remaining chocolate chip cookies. Add remaining cookie dough to cover the marshmallows.

Bake for 20-25 minutes, until the top of the cookie is golden brown.

Let the cookie cool for 30-45 minutes to set.