Prepare Choux Pastry: Cook water, butter, flour, salt, and sugar on the stovetop until smooth. Cool slightly, then add eggs one at a time until the dough is glossy and smooth.
Pipe the Dough: Transfer to a piping bag and pipe small mounds onto a lined baking sheet.
Bake: Bake at 200°C (390°F) for 20–25 minutes, then lower to 180°C (355°F) for 10–15 minutes until golden and puffed. Avoid opening the oven during baking.
Cool: Let the choux puffs cool completely on a wire rack.
Fill: Slice open or make a small hole in each puff, and fill with custard, whipped cream, or ice cream.
Top: Drizzle with warm chocolate sauce or dust with powdered sugar.
Serve: Serve immediately if filled with ice cream, or chilled if using custard/cream.