To make the ears, roll out half of both colors of fondant onto your work surface dusted with powdered sugar to ⅛"/3mm thick.
Use the end of a piping tip or circle plunger cutter to cut 36, approx 1"/2.5cm chocolate fondant circles.
Cut 36 white fondant circles slightly smaller and spray with edible gold mist.
Stick the gold circles to the brown ones with a dab of water applied with a clean finger or paintbrush.
Carefully pick up the joined circles and pinch the bottom to form the ears.
Place on a cookie sheet lined with parchment paper to dry for 2 to 6 hours.
Make some extra ears in case any break!
To make the cupcakes, preheat oven to 180C/350F/Gas 4 and line cupcake pans with 18 cupcake liners.
Sift the flour, cocoa powder, baking powder, baking soda, and salt, into a large bowl. Stir in the sugars.
Add the oil, buttermilk, egg, and vanilla extract. Stir until combined.
Use an ice cream scoop to distribute cupcake batter into the liners about ¾ full.
Bake for 17-20 minutes or until an inserted toothpick comes out clean.
Remove the cupcakes from the oven and allow to cool for 5 minutes in the pan, then transfer to a wire rack to cool completely.
To make the frosting, use an electric mixer and beat the butter on medium speed for 1 minute
Gradually beat in the powdered sugar and cocoa powder until combined.
Add the cream and vanilla and mix on medium-high speed until the frosting is smooth and creamy.
Place the frosting in a large piping bag fitted with a star tip and pipe frosting on top of each cooled cupcake.
Place the antlers into the cupcake on each side.
Place the ears just in front of the antlers.
Place a unicorn horn into the middle of the frosting in between the antlers and ears.
Using the red icing, pipe 3 red dots on the right side of the frosting in front of the ear.
Pipe two leaves using the green frosting behind the red dots for the holly. Enjoy!