Puff Pastry Cream Horns

Ingredients
For the custard cream

3 egg yolks
3 tablespoons (30 gr) of all-purpose flour
1/2 cup (100 gr) of sugar
1 teaspoon of vanilla extract
8 oz (235 ml) of milk
For the cannoncini

1 sheet of puff pastry, defrosted (about 8 oz, 225 gr)
1/4 cup (50 gr) of sugar
1 egg (for egg wash)
powdered sugar to decorate
How To Make Puff Pastry Cream Horns
Start by preparing the custard cream (crema pasticcera):

Warm up the milk until hot (not boiling).
In a medium sized pan, whisk the egg yolks with the sugar, vanilla extract and flour, until light and fluffy.