Place one cake layer on a cardboard cake round or plate. Pipe a 1/2-inch-tall border of icing around edge of first cake layer. Spoon half of chocolate mousse (about 2 cups) onto center of cake ...
The traybake and layer cake make up to 40 servings, and the cupcakes and fairy cakes make up to 24 cakes. If you're baking for larger numbers, simply re-run the calculator for a second batch.