1. Preheat the oven to 180° Celsius.
2. Mix premix and oil evenly until well blended to form a dough.
3. Knead dough and roll into a ball shape.
4. Make a circular imprint on top of the dough using piping nozzle.
5. Brush the top of the dough with some egg yolk.
6. Arrange on baking tray and bake for 22 minutes at 180° Celsius.