Preheat the oven to 350 degrees Fahrenheit. Grease a baking sheet or line it with
parchment paper.
Mix the softened butter, brown sugar, and granulated sugar together in a large stand
mixer. Then add the eggs one at a time, followed by the vanilla.
Mix in the baking soda. Then gradually combine the flour into the mixture.
Add the chocolate chips and graham cracker crumbs to the mixing bowl and combine
(be sure to save extra chocolate chips to top the cookies!).
Scoop 2 tablespoons of the cookie dough and roll it into a ball with your hands. Then
flatten it into a dome shape (about 2-3 inches in diameter) on the cookie sheet. Top the
cookie with 5-7 marshmallows and extra chocolate chips.
Bake the cookies for 10-12 minutes in the preheated oven. Be sure to take them out as
soon as they turn slightly golden as they will continue to bake on the baking sheet as
they cool.
Allow the cookies to cool on the baking sheet for about 10 minutes before transferring
them to a serving platter. Serve warm with a glass of milk and enjoy