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Preheat the oven to 375F and line a large baking sheet with parchment paper.
Unfold the puff pastry sheets and brush off any excess flour. Slice each sheet into 6 rectangles for a total of 12.
Transfer 6 of the rectangles onto the baking sheet, evenly spaced out. Place a block of chocolate into the center of each pastry.
Using your finger, brush the edges of each pastry with water and place the remaining 6 pastry rectangles on top. Crimp the edges with a fork to seal.
Bake for 25-30 minutes or until puffed and golden brown.
While the pastries bake, make the meringue. Place a metal mixing bowl over a pot of simmering water on the stove top. If using a stand mixer, use that bowl. Whisk in the egg whites and sugar and continue to whisk every so often. Heat until the sugar is dissolved. To test, rub a bit of the mixture between your fingers. If it’s smooth, it’s done. If it’s still grainy, continue to heat. It should take about 10 minutes.
Once dissolved, transfer the bowl to your stand mixer (or use a hand mixer) and add in the cream of tartar and vanilla. Whisk on high speed until thick, white, and fluffy. Stop when you reach stiff peaks.
Transfer the meringue to a piping bag fitted with a large round tip (or a large ziplock bag with a corner tip snipped off).
Once baked, allow the pastries to cool for about 10 minutes. While they cool, mix together the sugar, cinnamon, and graham cracker crumbs in a bowl.
Brush the pastries with melted butter, coating the edges, bottom, and a thin border around the top. Leave the top center blank so that the marshmallow meringue can stick. (see picture in post for reference)
Work with one pastry at a time, so brush with butter, toss in the cinnamon sugar mixture, then move on to the next one.
Once all the pastries are coated, pipe on the marshmallow meringue and toast with a kitchen torch (optional). Sprinkle on some extra chopped chocolate and leftover cinnamon sugar. Dig in!