Preheat the oven to 400°F (200°C).

Line a baking sheet with parchment paper.

In a saucepan, combine the water and butter over medium heat until the butter melts.

Once the butter is melted, add the flour and salt all at once, stirring vigorously for about 2 minutes.

Remove from heat and let it cool for a minute. Gradually add eggs, one at a time, mixing well after each addition until the dough is smooth.

Transfer the dough to a piping bag fitted with a large round tip. Pipe 1-inch rounds onto the prepared baking sheet, spacing them about 2 inches apart.

Bake for 20-25 minutes until golden and puffed. Do not open the oven door during baking.

Remove from the oven and let them cool on a rack.

Whip the cream with powdered sugar and vanilla, then fill the puffs using a piping bag.