- 1.
**Make the Choux Pastry:** Preheat oven to 200°C (400°F). Line a baking sheet with parchment paper.
- 2.
In a saucepan, combine water, butter, sugar (if using), and salt. Bring to a boil over medium heat, stirring until butter is melted.
- 3.
Remove from heat and immediately add the flour all at once. Stir vigorously with a wooden spoon until a smooth dough forms and pulls away from the sides of the pan.
- 4.
Return the pan to low heat and cook, stirring constantly, for 1-2 minutes to dry the dough slightly. This step is important for the pastry to puff up properly.
- 5.
Transfer the dough to a mixing bowl and let it cool for a few minutes.
- 6.
Gradually add the eggs, one at a time, beating well after each addition. The dough should be smooth, glossy, and have a thick, pipeable consistency. To test, lift the dough with a spoon. It should slowly fall off in a 'V' shape.
- 7.
Transfer the dough to a piping bag fitted with a plain round tip (or use two spoons). Pipe small mounds (about 1.5 inches in diameter) onto the prepared baking sheet, leaving some space between each puff.
- 8.
Bake for 20-25 minutes, or until golden brown and puffed up. **Do not open the oven door during baking!**
- 9.
Turn off the oven and leave the puffs inside with the door slightly ajar for 5-10 minutes to dry out further. This will prevent them from collapsing.
- 10.
Remove from the oven and let cool completely on a wire rack.
- 11.
**Make the Chestnut Cream:** In a bowl, whip the cold heavy cream until stiff peaks form.
- 12.
Gently fold in the chestnut puree and powdered sugar (if using) until well combined. Be careful not to overmix.
- 13.
Transfer the chestnut cream to a piping bag fitted with a small round tip.
- 14.
**Make the Chocolate Sauce:** In a small saucepan, heat the heavy cream over low heat until simmering.
- 15.
Remove from heat and add the chopped chocolate. Let it sit for a minute to melt, then stir until smooth and glossy.
- 16.
**Assemble the Profiteroles:** Use a small knife or skewer to make a small hole in the bottom of each choux pastry puff.
- 17.
Pipe the chestnut cream into each puff until filled.
- 18.
Arrange the filled profiteroles on a serving plate and drizzle generously with the chocolate sauce. Serve immediately or chill for later.
- 19.
Dust with powdered sugar, if desired, for extra decoration.