INGREDIENTS
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1 cup (2 sticks) butter, softened
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1 1/4 cups granulated sugar
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3/4 cup dark brown sugar (you can use light if that's all you have)
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1 ounce unsweetened baking chocolate, melted
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3 large eggs, at room temperature
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2 1/2 cups all-purpose flour
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1/2 cup unsweetened cocoa powder
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1 1/4 teaspoons baking powder
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1 1/4 teaspoons salt
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1 tablespoon vanilla extract
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1 1/2 cups semisweet chocolate chips