INGREDIENTS
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2/3 cup good quality cocoa powder
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1 3/4 cups all-purpose flour
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1 1/4 cups light brown sugar
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1 teaspoon baking powder
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3/4 teaspoon espresso powder, optional
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1 teaspoon baking soda
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3/4 teaspoon salt
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1 cup chocolate chips
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2 large eggs
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3/4 cup milk
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2 teaspoons vanilla extract
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2 teaspoons vinegar, white or cider
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1/2 cup (8 tablespoons) melted butter or 1/3 cup vegetable oil