Place parchment paper on your baking sheet and preheat oven to 350° F.
Using a stand mixer with the paddle attachment, mix butter and sugar on medium speed for about 2 minutes or until light and fluffy.
Turn the speed down to low and add the eggs and vanilla. Mix until smooth, remember to scrape the sides of the bowl as necessary.
Continue on low speed, add graham cracker crumbs, baking soda, and salt. Mix until combined.
Mix in flour until just combined. Stir in chocolate chips
Using a 3-tablespoon cookie scoop, drop the dough onto baking sheet, spacing out dough evenly.
Bake for 6 minutes, remove baking sheet from oven, and carefully place 3 mini marshmallows onto of the cookies. Return to the oven and bake for 6 more minutes.
Remove baking sheet from oven and immediately press one piece of chocolate (from broken chocolate bars) onto the top of each cookie. The heat from the cookie with melt the chocolate slightly.
Allow cookies to cool on baking sheet for 2 mins and then transfer to wire rack to fully cool. Enjoy!
Servings 12