"These whoopie pies, adapted from the Hummingbird Bakery, have a dark cake-like exterior and a billowy, marshmallow interior...."
INGREDIENTS
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1 large egg
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¾ cup 150 g sugar (brown, granulated or raw work great)
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⅔ cup 150 mL buttermilk
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½ tsp vanilla extract
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⅓ cup 75 g unsalted butter, melted and cooled slightly
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¾ tsp baking soda
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¼ tsp baking powder
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1 tsp instant espresso powder
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½ tsp salt (I didn’t add this in the video, but a touch of salt never hurts)
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⅔ cup 80 g unsweetened cocoa powder (or Dutch processed cocoa)
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1 and 1/2 cups (200 g all-purpose flour)
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½ cup 110 g unsalted butter, softened at room temperature
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1 cup 125 g confectioner’s sugar
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½ tbsp vanilla extract
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1 cup 85 g marshmallow fluff