INGREDIENTS
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Cooking spray
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3/4 cup all-purpose flour
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1 cup packed light brown sugar
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1/2 cup unsweetened cocoa powder (not Dutch process)
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1/2 teaspoon baking soda
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Kosher salt
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2/3 cup buttermilk
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1/4 cup vegetable oil
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1 teaspoon pure vanilla extract
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Vanilla ice cream, for serving