Crème pâtissière - Pastry Cream

I've seen other pastry cream recipes call for whipped cream instead of liquid cream. I've tried this, and it is a tasty variation but it also changes the texture, making it much lighter. In most of the recipes I use this for, a thicker, more unctuous texture is preferable.

1 cup milk
2 tsps. vanilla extract
3 egg yolks
¼ cup (50g) sugar
2 Tbsps. (16g) flour
¼ cup heavy cream (option: whipped cream)

1. Put the milk in a saucepan. Heat to a simmer, remove from heat, add vanilla, cover, and set aside to cool about 10 minutes. 
2. Whisk the yolks with the sugar until pale, then whisk in the flour. 
3. Gradually whisk the milk into the sweet egg mixture. 
4. Pour this back into the saucepan and, whisking constantly, bring to a boil, turn off the heat and cook, whisking, one minute. Remove from the heat. 
5. Strain into a bowl, cover with plastic wrap, and set aside to cool. 
6. When chilled, stream the cream in and mix with whisk until smooth.
7. OR, if you want a lighter cream, first whip the cream then gently fold in.