INGREDIENTS
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4 tablespoons (1/2 stick) unsalted butter
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1/2 cup plus 1 tablespoon granulated sugar
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1/4 cup plus 2 tablespoons unsweetened cocoa powder
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1/4 teaspoon salt
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1/2 teaspoon vanilla extract
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1 large egg
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1/4 cup all-purpose flour
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1/4 cup chocolate chips
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1 cup mini marshmallows
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3 tablespoons unsalted butter, melted
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2 tablespoons unsweetened cocoa powder
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1/2 cup powdered sugar
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1 tablespoon milk
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1/4 teaspoon vanilla extract