Ingredients
Equipment
Method
Make the Batter
- Preheat oven to 350F. Line a 12-cup muffin tin with paper liners. In a medium bowl, whisk together flour, cocoa powder, baking soda, and salt.
- In a large bowl with an electric mixer, beat softened butter and sugar on medium speed until light and fluffy, about 3 minutes. Scrape down the bowl. Beat in eggs one at a time, then add vanilla.
- Mix blue food coloring into buttermilk until uniform. Add flour mixture to butter mixture in three additions, alternating with blue buttermilk, beginning and ending with flour. Mix just until combined. Stir in vinegar quickly - the batter will slightly bubble and lighten in texture.
Bake
- Divide batter evenly among liners, filling each about two-thirds full. Bake 16 to 18 minutes until tops spring back when lightly touched and a toothpick comes out clean. Cool in pan 5 minutes, then transfer to a wire rack to cool completely before frosting.
Make the Frosting
- Beat cream cheese and butter together until smooth and fluffy, about 2 minutes. Gradually add powdered sugar on low speed, then increase to medium and beat until creamy. Beat in vanilla. Spread or pipe onto completely cooled cupcakes.
Notes
For the most vibrant blue, use gel food coloring rather than liquid - it won't thin the batter. The tiny amount of cocoa adds depth without making these taste chocolatey; skip it and you'll lose that classic velvet complexity. These actually improve after a day in the refrigerator, so make them ahead for parties.
