01 -
Preheat your oven to 350°F/175°C and prepare a 12-cup muffin tray with cupcake liners. In a large bowl, whisk together the flour, black cocoa powder, baking soda, and salt. In a separate jug, whisk the eggs, sugar, vegetable oil, vanilla extract, buttermilk, and white vinegar until smooth. Gradually combine the wet mixture with the dry ingredients, stirring until just smooth to avoid over-mixing.
02 -
Fill cupcake liners halfway with the batter. Bake for 18-20 minutes or until a toothpick inserted in the center comes out clean. Let cool in the tray for 15 minutes, then transfer to a rack to cool completely. Repeat for remaining batter.
03 -
In a stand mixer with the paddle attachment, beat butter and confectioners' sugar on low speed until combined. Increase to medium-high speed and beat for 2 minutes until thick. Add salt, vanilla, and cocoa powder. Start on low speed, then increase to medium-high and beat for another 2 minutes. Add the heavy cream on low speed and mix until smooth and spreadable.
04 -
Use a piping bag with a Wilton 1M tip to frost the cupcakes with the prepared buttercream. Serve and enjoy.