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Preheat the oven to 350 degrees F. Line muffin tins with paper liners.
In a small bowl, sift together the flour, cocoa powder, baking powder, baking soda, and salt. In a large measuring cup, combine the buttermilk, food coloring, vinegar, and vanilla.
In the bowl of an electric mixer fitted with the paddle attachment, beat the butter and sugar on medium speed for 1 minute, until light.
Add the eggs, one at a time, and beat until combined. With the mixer on low speed, add the dry ingredients and the wet ingredients alternately in 3 parts, beginning and ending with the dry ingredients, and mix until combined.
Stir with a rubber spatula to be sure the batter is mixed. Scoop the batter into the muffin cups with a 2 1/4-inch ice cream scoop or large spoon. Bake for 25 to 30 minutes, until a toothpick inserted in the centers comes out clean.
Cool completely in the pans and frost the cupcakes with Red Velvet Frosting.
To prepare frosting, combine powdered sugar and remaining ingredients in a medium bowl. Beat with a mixer at medium speed until combined. Increase speed to medium-high, and beat until smooth. Spread about 1 tablespoon frosting on top of each cupcake.
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