Allow your cupcakes to cool completely before decorating. Line a baking sheet with wax paper. On a clean surface, add a light coat of cornstarch.

With a rolling pin (you may dust it with cornstarch as well), roll out fondant so that it’s about ¼ of an inch thick.

Using a small star cookie cutter, cut out 12 star shapes and place carefully on a lined baking sheet.

Next, cut out circles from the rolled-out fondant (we used the opposite end of an icing tip). Brush the back of each circle with a bit of water and place one in the middle of each star. The water will help the two fondant pieces to stick together.

Using a stand mixer, start beating butter, sugar, cocoa powder and milk on medium speed. As the buttercream starts to form, increase to high. Add the gel food colouring
until you achieve the shade of blue you desire.

Using a piping bag, frost each cupcake. Then place one fondant star on every cupcake.