01 -
Preheat oven to 350°F (175°C) and line a 12-cup muffin tin with cupcake liners.
02 -
In a large bowl, whisk together flour, granulated sugar, cocoa powder, baking powder, baking soda, and salt until evenly combined.
03 -
In a separate bowl, whisk together buttermilk, vegetable oil, eggs, and vanilla extract until smooth and uniform.
04 -
Gradually pour wet ingredients into dry mixture, stirring gently until just combined; pour in brewed coffee and mix until batter is smooth but not overmixed.
05 -
Divide batter evenly among liners, filling each about two-thirds full. Bake 18–22 minutes or until a toothpick inserted in center comes out clean.
06 -
Allow cupcakes to cool in pan for 5 minutes then transfer to a wire rack until completely cooled before frosting.
07 -
Beat softened butter on medium-high speed until pale and fluffy, about 3 minutes. Gradually add powdered sugar on low speed then increase. Add heavy cream, vanilla extract, salt, and orange gel color. Beat until light and creamy, about 2 minutes.
08 -
Using a piping bag fitted with a large star or round tip, pipe tall swirls of buttercream onto cooled cupcakes. Decorate with Halloween-themed sprinkles or garnishes as desired.