Mix the melted white chocolate chips and matcha powder in a bowl.
Spread parchment paper on your working surface and place the Kit Kat fingers on top, while maintaining a large space between them.
Add the chocolate-matcha mixture to the piping bag and squeeze it out while creating a triangle for the upper part of the tree (as shown in the video).
Spread the sprinkles on top of the triangle and refrigerate for an hour before serving.