01 - Preheat oven to 400°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together all-purpose flour, graham cracker crumbs, baking soda, baking powder, and sea salt. Set aside.
03 - Using a mixer, beat cold cubed butter, brown sugar, and granulated sugar until light and creamy, about 3 minutes.
04 - Add cold eggs one at a time, mixing thoroughly after each addition. Stir in vanilla extract.
05 - Gradually add the dry ingredients to the wet mixture, mixing just until incorporated.
06 - Fold in chocolate chips, mini marshmallows, and chopped graham crackers until evenly distributed.
07 - Divide dough into 12 equal pieces, approximately 4 ounces each. Shape into tall, rough balls. Press additional marshmallows and milk chocolate pieces onto tops if desired.
08 - Position dough balls at least 3 inches apart on prepared baking sheets.
09 - Bake for 10 to 12 minutes, until edges are golden and centers remain slightly underbaked.
10 - Allow cookies to cool on baking sheets for 10 minutes, then transfer to a wire rack to cool completely. Serve while warm for best texture.