Place the egg yolks into a medium sized pot (off the heat).
Add the sugar and potato or corn starch and whisk together until uniform.
When the mixture is smooth, place the pot on the stovetop. Begin pouring in the warm milk whilst whisking. Turn the heat on to medium.
Continue whisking and gradually increase the heat. The pastry cream will thicken as it heats up.
When the mixture comes to a boil, let it cook for about 3 minutes then remove from the heat. Add the vanilla and keep stirring as it cools so that it doesn't form a skin. Move into a large bowl and set the bowl into a larger bowl with ice water (if you need to cool it quickly), then refrigerate covered until completely chilled.
Use as desired.
Notes
If you want a lighter version of this pastry cream, whip 4 oz (120 ml) of heavy whipping cream until stiff and then fold into the chilled pastry cream.
You can add more or less cream to your liking, and also add a little sugar to the cream when whipping (I prefer it without).
Adding a tablespoonful of Grand Marnier (at the end) makes a lovely addition, too.
Pastry cream can be kept refrigerated for 1 or 2 days, but must be consumed promptly once the pastries are filled.
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