✓ Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper.

✓ Combine water, butter, and salt in a saucepan. Bring to a boil.

✓ Add flour and stir until the mixture forms a ball.

✓ Transfer dough to a mixing bowl and let cool. Add eggs one at a time.

✓ Pipe dough into rounds on the prepared baking sheet. Bake until golden brown.

✓ Prepare custard by heating milk and sugar. Temper egg yolks with the milk mixture.

✓ Cook custard until it thickens. Stir in vanilla extract and butter. Chill.

✓ Fill cooled pastries with custard. Dust with powdered sugar.