01 -
Get the oven warmed up to 350 degrees Fahrenheit (175°C). Make sure the rack’s in the center.
02 -
Mix your sugar, flour, cocoa, salt, baking powder, and baking soda together in a roomy bowl. Sifting can make this smoother.
03 -
In another bowl, whisk the buttermilk, oil, eggs, and vanilla until they’re well blended. This only takes a minute or two.
04 -
Slowly add the dry mix into the liquids a bit at a time, stirring gently. Once it’s incorporated, carefully pour in the hot water and stir until it’s all mixed. The batter’ll be runny, but that’s how it should be.
05 -
Grab cupcake liners and set them in the tray. Give them a quick spray with cooking oil and pour the batter in—fill them about three-quarters of the way.
06 -
Slide the tin into the preheated oven and bake for 18–22 minutes. They’re done if a clean toothpick poked in the center comes out dry.
07 -
Once baked, take the cupcakes out and wait until they’re fully cooled before adding frosting. Don’t rush this!
08 -
As the cupcakes cool off, beat together the butter and cocoa. Add powdered sugar a bit at a time, mixing in a splash of milk or cream until the frosting gets fluffy.
09 -
Spread or pipe on the buttercream frosting. Then top it with sprinkles, chips, or anything fun you like.