Make the box of cake mix according to the package directions. Divide between 24 muffin cupcakes and bake as directed. Cool the cupcakes completely.

Meanwhile, place the butter in a large mixing bowl. Beat on medium speed until smooth. Add in the vanilla and mix well.

Add the powdered sugar, a half cup at a time, until desired consistency is reached. Mix in the milk and then add more powdered sugar if needed.

Remove half a cup of the frosting to a separate bowl and dye it with the black food coloring.

Frost the cupcakes with the white frosting.

Put the black frosting in a piping bag and pipe a black spiral, starting at the middle and going to the edge, around the cupcake. Place mini M&M's on the spiral to look like Christmas lights.