Rich and chocolatey without being dense, these red-hued cupcakes feature buttermilk in the batter for tang and tenderness. Meanwhile, vinegar and baking soda kick-start a chemical reaction to give the batter a lift as it bakes. White chocolate buttercream frosting is, quite literally, the icing on the cake. To top things off, candied cherries and colored sprinkles set a festive tone, though really you can decorate the cupcakes however you like.