01 -
Gently heat the milk—don’t let it boil. In a separate bowl, whip together the egg yolks, sugar, vanilla, and flour until fluffy. Slowly pour the warm milk into the mix. Cook everything on medium, stirring nonstop, until thickened. Let it cool and refrigerate for at least an hour.
02 -
Turn on your oven to 400°F. Sprinkle white sugar on your counter and roll out the puff pastry into a 9x12-inch rectangle. Cut it into 12 long strips, about 1-inch each.
03 -
Take each strip and wrap it snugly around the molds, slightly overlapping as you go. Place them on a tray, seam side down, that’s lined with baking paper.
04 -
Stir a tablespoon of water into the beaten egg and carefully brush it over the pastry. Avoid letting any touch the molds.
05 -
Pop them into the oven at 400°F. Bake for 15-20 minutes until they’re golden brown. Let them sit for a few minutes to cool before easing the molds out.
06 -
Fill the cooled puff pastry horns with the custard using a pastry bag. Dust some powdered sugar on top for a final touch.