INGREDIENTS
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1 1/2 cups all-purpose flour
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1/4 cup good-quality cocoa powder
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1 teaspoon ground espresso powder (optional)
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1/2 teaspoon baking powder
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1/2 teaspoon fine sea salt
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4 ounces (8 tablespoons) unsalted butter
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8 ounces good-quality semi-sweet chocolate, coarsely chopped
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4 large eggs
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1 1/2 cups sugar
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2 teaspoons pure vanilla extract
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1 1/2 cups (about 7 ounces) marshmallow fluff
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1/2 cup salted caramel sauce, store-bought or
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1 cup milk chocolate chips or pieces