Melt ¾ cup White chocolate couverture in a bain-marie, microwave, or using a tempering device, and let it cool until it is just lukewarm (about 68 °F / 20 °C). Stir again and again so that the chocolate does not become solid.
¾ cup White chocolate couverture
Meanwhile, beat ¼ tbsp Butter (room-warm) until fluffy, then add 5.3 oz Cream cheese and mix well. Finally, add the cooled white chocolate and stir in.
5.3 oz Cream cheese, ¼ tbsp Butter
Pour the cream into a pastry bag with a star-shaped nozzle and pipe it on the cupcakes.