01 -
Heat the oven to 350°F. Line a 12-cup muffin pan with paper liners.
02 -
In a large bowl, combine the cake mix, buttermilk, melted butter, eggs, and vanilla. Beat until smooth, about 2 minutes.
03 -
Divide the batter among the liners, filling each about two-thirds full. Bake for 17-20 minutes, until a toothpick inserted in the center comes out clean. Cool completely on a rack.
04 -
Beat the softened butter until creamy. Add powdered sugar, vanilla, salt, and 3 tablespoons milk. Beat until fluffy, adding more milk a teaspoon at a time if needed.
05 -
Spread a thick layer of white frosting over each cooled cupcake. Reserve about half the frosting for the tree cones.
06 -
Tint the reserved frosting green. Hold each sugar cone from the inside and spread green frosting over the outside. Roll in sanding sugar and sprinkles while the frosting is soft.
07 -
Press one frosted cone into the center of each cupcake. Add a star sprinkle to the top and let the cupcakes stand for 15 minutes before serving.