"Active time: 10 min Start to finish: 45 min..."
INGREDIENTS
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1 1/2 sticks (3/4 cup) unsalted butter
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5 oz unsweetened chocolate, coarsely chopped
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2 cups sugar
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1 tablespoon instant-espresso powder or instant-coffee granules
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1 teaspoon vanilla
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1/2 teaspoon salt
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4 large eggs
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1 cup all-purpose flour
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3/4 cup semisweet chocolate chips