1. In a small bowl, whisk together 250g of flour and 200g of confectioners sugar.

2. In a separate bowl, whisk together 4 large egg yolks and 200g of granulated sugar until the mixture turns pale yellow.

3. Add 115g of softened butter to the egg yolk mixture and whisk until smooth.

4. Gradually pour in 240ml of heavy whipping cream, whisking until stiff peaks form.

5. Add 5g of vanilla powder and whisk until combined.

6. In a separate bowl, mix together the flour mixture and 120ml of water to form a dough.

7. Knead the dough for 5-7 minutes until it becomes smooth and elastic.

8. Divide the dough into 12 equal pieces and shape each into a ball.

9. Flatten each ball slightly into a disk shape.

10. Place a small spoonful of the vanilla cream in the center of each disk.

11. Fold the dough over the filling, forming a ball shape, and press the edges together to seal.

12. Place the pastry balls on a baking sheet lined with parchment paper, leaving about 2.5cm of space between each ball.

13. Bake in a preheated oven at 180°C (350°F) for 15-20 minutes, or until golden brown.