INGREDIENTS
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1 cup (2 sticks) unsalted butter
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2 1/4 cups sugar
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4 large eggs
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1 1/4 cups Double-Dutch Dark Cocoa or Dutch-process cocoa
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1 teaspoon salt
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1 teaspoon baking powder
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1 teaspoon espresso powder (I omitted)
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1 tablespoon vanilla extract
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1 1/2 cups All-Purpose Flour
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2 cups chocolate chips