1. Prepare the baking sheets by lining two large pans with parchment paper and preheating the oven to a hot temperature so the profiteroles rise properly.

2. Make the choux base by heating the water, milk, butter, salt, and sugar in a saucepan until the mixture just begins to simmer and the butter is fully melted.

3. Add the flour all at once, then stir vigorously over low heat until the dough pulls away from the sides of the pan and leaves a light film on the bottom.

4. Transfer the hot dough to a mixing bowl and let it cool for a few minutes so it is warm but not steaming before adding the eggs.

5. Beat in the eggs one at a time, mixing well after each addition, until the dough is smooth, glossy, and thick enough to hold a soft peak when lifted with a spoon.

6. Spoon the choux dough into a piping bag fitted with a round tip and pipe small mounds onto the prepared trays, spacing them apart to allow for expansion.

7. Smooth any pointed tips on the mounds with a damp fingertip, then bake until the profiteroles are puffed, deeply golden, and feel light when gently lifted.

8. Near the end of baking, use a skewer or small knife to prick a tiny hole in each puff, then return them to the oven briefly to dry out the centers.

9. Move the baked shells to a wire rack and let them cool completely before filling so the cream does not melt.

10. Make the vanilla cream by whipping the heavy cream, powdered sugar, and vanilla together in a chilled bowl until medium-stiff peaks form.

11. Spoon the whipped cream into a clean piping bag fitted with a small round or star tip and keep it chilled until you are ready to fill the shells.

12. Use a small knife to make a hole in the side or bottom of each cooled shell, then pipe in the vanilla cream until each profiterole feels slightly heavy and full.

13. Prepare the ganache by warming the heavy cream until steaming, then pouring it over the chopped chocolate and a little butter in a heat-safe bowl.

14. Let the mixture sit for a minute, then whisk until the chocolate is fully melted and the ganache is smooth, shiny, and slightly thickened.

15. Dip the tops of the filled profiteroles into the ganache, allowing excess to drip back into the bowl, and place them upright on a rack or tray.

16. While the chocolate is still tacky, gently brush or sprinkle the tops with edible gold dust or press on small pieces of gold leaf for a luxurious finish.

17. Chill briefly to set the chocolate, then serve the profiteroles slightly chilled or at cool room temperature for the best texture and flavor.