01 - Preheat oven to 350°F and line a 12-cup muffin tin with paper liners.
02 - In a medium bowl, whisk together flour, cocoa powder, baking soda, and salt. Set aside.
03 - In a large bowl, beat the butter and sugar until light and fluffy, about 2-3 minutes.
04 - Add eggs one at a time, beating well after each addition.
05 - Add buttermilk, sour cream, vanilla extract, and red food coloring to the mixture, stirring until combined.
06 - Add dry ingredients to wet ingredients in two additions, mixing gently until just combined.
07 - Stir in white vinegar gently to the batter.
08 - Divide batter evenly into liners, filling each about two-thirds full.
09 - Bake for 16-18 minutes, or until a toothpick inserted in the center comes out clean.
10 - Allow cupcakes to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.
11 - Beat cream cheese and butter together until smooth and creamy.
12 - Gradually incorporate powdered sugar, vanilla extract, and a pinch of salt; beat until fluffy.
13 - Once cupcakes have cooled completely, frost generously using a piping bag or spatula.