Preheat oven to 180˚C.
Mix Dr. Oetker Nona Tarts Original and Dr. Oetker Corn Starch with butter and egg until dough forms. Fold in Dr. Oetker Nona Chocolate Chips and Mini Button Sugar.
Roll dough into balls (approximately 2.5cm) and place the dough on baking tray. Flatten the dough slightly with palm.
Bake at 180˚C for 15 minutes, set aside.
For filling, place cream cheese and butter in a bowl and mix at high speed until smooth.
Add in icing sugar and vanilla flavour, mix until smooth.
Spread cream cheese over one cookie, cover with another cookie and press together to make a sandwich.
Place mini button sugar in a bowl, roll sandwich cookie over it.