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Preheat your oven to 350°F (175°C). Line a muffin tin with cupcake liners.
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In a large bowl, whisk together the flour, sugar, cocoa powder, baking powder, baking soda, and salt.
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In another bowl, combine buttermilk, vegetable oil, eggs, and vanilla. Mix well.
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Gradually add the wet ingredients to the dry ingredients, mixing until just combined.
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Carefully stir in the boiling water (the batter will be thin).
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Divide the batter evenly among the cupcake liners, filling each about two-thirds full.
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Bake for 18-20 minutes or until a toothpick inserted into the center comes out clean.
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Allow the cupcakes to cool in the pan for 5 minutes before transferring them to a wire rack to cool completely.