Preheat the oven to 325ºF (170ºC). Line a baking sheet with aluminum foil.
In a small mixing bowl stir together the graham cracker crumbs, sugar and unsalted butter until the mixture comes together in small pieces. Spread evenly on the baking sheet and bake until golden brown, about 10 to 12 minutes.
For the pancakes:
In a large mixing bowl whisk together the flour, baking powder, salt and granulated sugar. In medium mixing bowl whisk together the eggs and milk.
Slowly add the wet ingredients to the dry and stir until just combined. Small lumps are fine but if the batter seems thick, add a little more milk. Stir in the chocolate chips then prepare the skillet.
Heat a large skillet or griddle over medium heat, add 2 teaspoons of the melted butter and wait for the butter foam to subside.
Pour about ¼ cup of batter into the pan, and cook until small bubbles rise to the surface, about 2 minutes. Flip and continue cooking until both sides are golden brown, about an additional 1 to 2 minutes.
Remove to a plate or keep warm in an oven heated to 200ºF. Repeat with the remaining pancake batter adding more butter as necessary.
To serve:
Divide pancakes among plates, spreading about 2 tablespoons of the graham cracker crumble in between each pancake. Drizzle chocolate sauce over the top of each stack of pancakes. Top with mini marshmallows.
Serve them as is or use a kitchen torch to brown the marshmallows by holding the flame a few inches away.