01 -
Heat milk in a saucepan until warm.
02 -
In a bowl, whisk egg yolks, sugar, vanilla, and flour until light and fluffy.
03 -
Gradually pour the milk into the egg mixture while stirring continuously.
04 -
Return the mixture to the saucepan and cook over medium heat, stirring constantly, until it thickens.
05 -
Remove from heat, transfer to a bowl, cover, and refrigerate for 1 hour.
06 -
Preheat oven to 400°F (200°C).
07 -
Roll out puff pastry on a sugar-dusted surface into a 9x12-inch rectangle. Cut into 12 strips.
08 -
Wrap each strip around a horn mold, overlapping slightly, and place seam-side down on a parchment-lined baking sheet.
09 -
Brush with egg wash and bake for 15-20 minutes until golden brown.
10 -
Cool slightly before removing from molds.
11 -
Use a piping bag to fill the cooled pastry horns with custard cream.
12 -
Dust with powdered sugar before serving.