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Preheat the oven to 350 F. Line the muffin pan with 10 cupcake liners. Set aside.
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In a large bowl, whisk together the flour, sugar, cocoa powder, baking soda, and salt.
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In a medium bowl, whisk together the buttermilk, vegetable oil, espresso (coffee), egg, and vanilla.
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Add the buttermilk mixture into the flour mixture, beating on low speed until incorporated.
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Transfer the batter to the prepared muffin pan, filling each cup ¾ full.
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Bake the cupcakes for 15-18 minutes or until a toothpick inserted into the center of the cupcake comes out clean.
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Allow the cupcakes to cool in the pan for 10 minutes and then transfer the cupcakes to a wire rack to cool completely.