INGREDIENTS
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6 ounces semi-sweet chocolate, chopped
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3 ounces unsweetened chocolate, chopped
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3 tablespoons unsalted butter
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3 large eggs
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1 cup sugar
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1 ½ teaspoon instant espresso powder
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½ teaspoon vanilla extract
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½ cup all-purpose flour
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½ teaspoon baking powder
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½ teaspoon Kosher salt
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1 cup mini chocolate chips
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Fleur de sel or other flaked sea salt, for garnish