Step 1: Preheat and Prepare – Preheat your oven to 350°F (175°C). Line two 12-cup muffin tins with paper liners to prevent sticking and ensure easy removal.
Step 2: Combine Dry Ingredients – In a large mixing bowl, whisk together the sugar, flour, cocoa powder, baking soda, baking powder, and salt. Ensure there are no large lumps of cocoa or flour.
Step 3: Mix in Wet Ingredients – Add the eggs, buttermilk, vegetable oil, and vanilla extract to the dry mixture. Beat on medium speed with a hand mixer or stand mixer for about two minutes. The batter will be thick at this stage.
Step 4: Incorporate Hot Coffee – Stir in the hot coffee by hand using a spatula or whisk. The batter will become very thin and watery, but don’t worry—this is exactly how it should look! The hot liquid helps dissolve the cocoa for a smoother flavor.
Step 5: Fill and Bake – Pour the batter into the prepared muffin liners, filling each about two-thirds full. Bake for 18 to 22 minutes, or until a toothpick inserted into the center comes out clean.
Step 6: Cool Completely – Allow the cupcakes to cool in the pans for about 5 to 10 minutes before transferring them to a wire rack. Let them cool completely before adding any frosting or decorations.