137g packet Original Oreo Cookies
Midnight Magic Sprinkles, to decorate
75g unsalted butter, melted
½ cup caster sugar
½ cup self-raising flour
¼ cup milk
2 tablespoons cocoa powder, sifted
300g unsalted butter, chopped, at room temperature
3 cups icing sugar mixture
1 tablespoon milk
Violet and leaf green food colouring gels, to tint
Line two x 12-hole mini muffin pans (1-tablespoon capacity) with paper cases.
To make cupcakes, place all ingredients in a small bowl of an electric mixer. Beat on low speed for 20 seconds, or until just combined. Then beat on high speed for a further 1 minute, or until smooth and thick. Spoon evenly into paper cases (about 1 tablespoon each).
Cook in a moderate oven (180C) for about 10 to 12 minutes, or until just firm when lightly touched in the centre. Remove. Stand in pans for 5 minutes. Transfer to a wire rack to cool.
To make frosting, beat butter in a small bowl of an electric mixer until pale and creamy. Beat in sugar, ½ cup at a time, until combined. Beat in milk. Transfer 1 ½ cups to a bowl and tint violet. Tint remaining frosting dark green.
Transfer dark green frosting to a disposable piping bag fitted with a 9mm star nozzle. Transfer violet frosting to a disposable piping bag fitted with a 5mm plain nozzle.
To assemble, twist 12 of the cookies to separate halves. Pipe dark green frosting onto each cupcake. Top with a cookie, centre-side facing down. Pipe violet frosting onto cookies to create witch hats. Decorate with sprinkles.