INGREDIENTS
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1 1/4 cups (5.5 ounces ) all purpose flour
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1/3 cup unsweetened natural cocoa powder
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1 tsp. baking powder
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1 tsp. instant expresso powder ( optional)
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1/4 tsp. salt
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1 stick ( 4 ounces) unsalted butter, at room temperature
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1/4 cup granulated sugar
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3/4 cup packed light brown sugar
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1 large egg
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1 large egg yolk
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1/2 tsp. vanilla extract
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8 ounces semisweet chocolate, chopped