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Bake the Puff Pastry
- Preheat oven to 400°F (200°C).
- Roll puff pastry sheets slightly to even thickness.
- Place on parchment-lined baking trays and prick all over with a fork to prevent too much puffing.
- Place another baking sheet on top (to keep it flat) and bake for 15 minutes.
- Remove the top sheet and bake another 5–10 minutes until golden brown.
- Cool completely, then trim to equal rectangles. You’ll need three layers.
Make the Pastry Cream
- Heat milk and half the sugar in a saucepan until steaming (not boiling).
- In a bowl, whisk egg yolks, remaining sugar, and cornstarch until pale.
- Slowly pour in hot milk while whisking to temper the eggs.
- Return mixture to the saucepan and cook over medium heat, whisking constantly until thickened.
- Remove from heat, stir in vanilla and butter.
- Cover with plastic wrap touching the surface and chill until cold.
Assemble the Mille-Feuille
- Place the first pastry layer on a serving tray.
- Pipe or spread half the pastry cream evenly.
- Top with the second pastry sheet, add the rest of the cream, and smooth.
- Add the third pastry sheet on top.
Glaze and Feather
- Mix powdered sugar, milk, and vanilla until you have a thick but spreadable icing.
- Spread over the top pastry layer.
- Drizzle thin lines of melted chocolate across the glaze, then drag a toothpick in alternating directions to create a feathered pattern.
Chill and Slice
- Refrigerate for at least 2 hours to set before slicing with a sharp knife.
- Wipe the knife between cuts for clean layers.
Tips for Mille-Feuille Perfection
- For cleaner slices: Freeze for 15 minutes before cutting.
- Use all-butter puff pastry for the best flavor.
- The pastry cream can be flavored with coffee, chocolate, or fruit puree for variations.