Step 1

Preheat oven to 350 degrees F. Line a cookie sheet with parchment paper and spray with cooking spray. Using a mixer, cream the butter and sugars until light and fluffy, about 3 minutes. Add the egg and vanilla and beat for an additional 2 minutes.

Step 2

Meanwhile, use a food processor or blender to crush 7 graham cracker sheets into 3/4 cup fine crumbs. In a separate bowl, whisk together the graham cracker crumbs, flour, baking powder, and salt. Slowly add the dry ingredients to the wet ingredients, and mix on low speed until the dough just comes together. Add the chocolate and marshmallows and stir to combine.

Step 3

Place 1.5 tablespoon sized scoops of dough onto the prepared cookie sheet. Bake at 350 for 10-12 minutes.