In a large mixing bowl, beat together confectioners’ sugar, custard powder, butter, and milk with a mixer at medium-high speed until combined, 3 to 4 minutes. Place Custard Cream Filling in a covered container and refrigerate until slightly chilled, approximately 20 minutes. (Mixture should be soft enough to pipe onto cookies.) Use immediately.
Notes
*We used Bird’s Original Custard Powder.
Recipe by TeaTime Magazine at https://teatimemagazine.com/custard-cream-cookies-recipe/