Preheat oven to 180˚C.
Place Dr. Oetker Nona Tarts Mix, butter and egg in a mixing bowl. Mix well.
On a floured surface, roll the dough to 0.5cm thickness. Cut the dough into shapes with cookies cutter.
Bake at 180˚C for 15 - 18 minutes and set aside to cool down.
Melt cooking chocolate with microwave oven or a saucepan of boiling water.
Fill the sunken part with melted Dr. Oetker Nona Cooking Chocolate. Leave to set before serving.