Cut 12 circles out of the puff pastry and put them in the muffin tin. Slightly pull them up to the edges so that you can later on fill the cream into the puff pastry.
Pour cream and milk into a pan and add sugar, cinnamon, nutmeg and salt to it. Warm the mixture up and keep stirring, until the sugar has dissolved. Let it cool for a few minutes.
Whisk the eggs together and slowly pour in the warm milk, be careful to keep stirring and that it doesn't get too warm. Let it cool for approx. 20 minutes in the fridge.
Preheat the oven to 210 °C. Pour the custard into the muffin tins until 2/3 full. Bake for approx. 20 minutes until the tops are slightly caramelized and dark.
Tipps
You can serve the Pastel de Nata with icing sugar and cinnamon on top.