Preheat oven to 375°. Lightly oil cupcake molds or egg tart tins.
Roll out dough into ¼ inch thickness. *IMPORTANT - need to work fast because puff pastry needs to be cold, if it warms and softens, put back in fridge/freezer until completely cold
Cut dough to fit the dimension of your tin. (I found that a Mason Jar lid was the perfect size for cupcake mold)
Press dough into shape of your tin. (If using cupcake mold, shape to ¾ of cupcake mold, not all the way to the tip)
Pour in egg custard filling into puff pastry about 90% full.
Remove any air bubbles from filling with spoon.
Bake at 375° foe 20 mins.
Let cool a bit before taking out of tray and enjoy!