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Ingredients

• 4 tablespoons unsalted butter, melted
• 1 cup graham cracker crumbs
• 10 tablespoons (1¼ sticks) unsalted butter
• 1¼ cups (8.75 oz) granulated sugar
• ¾ cups plus 2 tablespoons (2.5 oz) unsweetened cocoa powder
• ¼ teaspoon salt
• 1 teaspoon vanilla extract
• 2 large eggs
• ½ cup (2.25 oz) all-purpose flour
• 1 cup milk chocolate chips
• ½ cup marshmallow fluff
• 1 cup mini marshmallows