Preheat the oven to 375 degrees. Line a large sheet pan with parchment paper.

In the bowl of an electric mixer, cream the butter with the white and brown sugar until light and fluffy. Add the eggs and vanilla and mix until combined.

In a medium bowl, whisk together the flour, baking soda, sea salt, and cinnamon (if using) to combine. Set aside.

Add the flour mixture to the butter mixture and combine on low speed.

Fold in the chocolate chips and marshmallows.

Lay out graham cracker squares side by side on the pans as close as possible. You may need to adjust the number of graham crackers used.

Place 1 1/2 tablespoons of dough on each graham cracker square, about 1 – 1 ½ inches apart. Press 1-2 mini marshmallows on top of the dough balls for extra s'mores look.

Bake for 9-12 minutes until the edges turn golden brown. Remove to a wire rack to cool.

After 2-3 minutes of cooling, press the Hershey’s bar pieces on top. Optionally, sprinkle with flaky salt. Cut cookies once they are completely cool.