The Proper French Éclair Crispy Choux Pastry Filled with Rich Vanilla Crème Pâtissière

Stage 1: Making the Crème Pâtissière (Must be chilled first). Gently heat milk and vanilla until just simmering. Remove from heat.

In a separate bowl, vigorously whisk egg yolks and sugar until pale and thick. Whisk in cornstarch until smooth.

Temper the yolks by slowly pouring half the hot milk into the yolk mixture while whisking constantly.

Pour the tempered mixture back into the saucepan with the remaining milk. Cook over medium heat, stirring constantly with a spatula, until the mixture boils and thickens significantly (about 1 minute after boiling).

Remove from heat. Stir in cold butter until melted and smooth. Strain the cream into a shallow dish. Cover surface directly with plastic wrap and chill for at least 2 hours.

Stage 2: Making the Pâte à Choux. In a saucepan, combine water, milk, butter, sugar, and salt. Bring to a rolling boil until the butter is completely melted.

Remove from heat immediately. Dump in all the sifted flour at once. Stir vigorously with a wooden spoon until a cohesive ball forms and the mixture pulls away cleanly from the pan sides.

Return the dough ball to low heat for 1–2 minutes, stirring constantly to cook out excess moisture.

Transfer dough to a stand mixer fitted with the paddle attachment. Beat on medium speed for 1 minute to cool slightly. Add eggs one at a time, ensuring each egg is fully incorporated before adding the next. The final consistency should be smooth, glossy, and slowly drip off the paddle in a ‘V’ shape.

Transfer dough to a piping bag fitted with a large plain round tip. Pipe 4–5 inch (10–12 cm) straight logs onto parchment-lined baking sheets, leaving space between them.

Stage 3: Baking the Éclairs. Preheat oven to 400°F (200°C). Bake for 15 minutes at this temperature.

Reduce heat to 350°F (175°C) and bake for another 15–20 minutes until deeply golden brown and hollow-sounding when tapped. Do not open the oven door during the first 20 minutes!

Turn off the oven, prop the door ajar with a wooden spoon, and let the éclairs dry out for 10 minutes. Cool completely on a wire rack.

Stage 4: Assembly and Glazing. Gently heat heavy cream until simmering. Pour over chopped chocolate and corn syrup (if using). Let sit for 2 minutes, then stir until perfectly smooth and glossy. Let cool slightly until thick.

Transfer chilled pastry cream to a piping bag fitted with a small filling tip. Poke two small holes into the bottom side of each cooled éclair shell and pipe cream in until the éclair feels heavy.

Dip the top of each filled éclair into the chocolate glaze, or use a spatula to spread a thin, even layer across the top. Allow the glaze to set before serving.