INGREDIENTS
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3 tbsp. all-purpose flour, plus more for surfac
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1/2 recipe Basic Pie Dough
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2 graham crackers, divided
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2/3 c. sugar
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1/3 c. cocoa powder
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1/4 tsp. Kosher salt
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4 tbsp. unsalted butter, melted
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1/2 tsp. pure vanilla extract
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1 large egg, plus egg wash for crust
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6 large marshmallows, halved