INGREDIENTS
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1 1/4 cups all purpose flour
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1 teaspoon salt
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2 tablespoons unsweetened Dutch Process cocoa powder
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11 ounces dark chocolate, roughly chopped
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1 cup (2 sticks) unsalted butter, cut into 1-inch chunks
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optional: 1 teaspoon instant espresso powder
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1 1/2 cups granulated sugar
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1/2 cup packed light brown sugar
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5 eggs, at room temperature*
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2 teaspoons vanilla extract