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INGREDIENTS
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10 tablespoons unsalted butter
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1 1/4 cups sugar
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3/4 cup plus 2 tablespoons unsweetened cocoa powder (I prefer Dutch process cocoa powder)
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1/2 teaspoon salt
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1 teaspoon baking powder
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1 teaspoon pure vanilla extract
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2 large eggs
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1/2 cup all-purpose flour
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1/2 cup chocolate chips (optional)
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1/2 cup chopped walnuts (optional)