S'mores Cookie Bars for 24 Servings

Instructions:

1. Line a 9x13 inch baking pan with parchment paper, leaving an overhang on the sides.
2. In a medium bowl, whisk together the all-purpose flour, 75g graham cracker crumbs, baking soda, and salt until no lumps remain.
3. Cream the softened butter and brown sugar together until the mixture is pale and fluffy.
4. Beat in the egg and vanilla extract.
5. Gradually fold in the dry ingredients using a spatula until just combined, then stir in the semi-sweet chocolate chips.
6. Press the dough evenly into the prepared pan and bake at 350°F (175°C) for 18-22 minutes until edges are deep golden brown.
7. Remove from oven and immediately press the milk chocolate squares and mini marshmallows into the top of the hot cookie layer.
8. Return to the oven for 5-7 minutes, or until marshmallows are puffed and toasted.
9. Garnish with additional graham cracker crumbs before serving.