Heat the milk in the microwave for 50 seconds on 500W.
Dissolve the sugar into the milk.
Add the flour. Even if you don't sift it, it will be fine if you mix it in well!
At this point is has probably already cooled down. Add the egg yolk and mix it in evenly.
Optionally add some flavoring.
Mix and then lightly cover with plastic wrap. (Just place it on top.)
Microwave for 40 seconds.
Mix. Repeat Steps 7-8. First heat for 40 seconds, then 30 seconds, then 10 seconds. Check the consistency each time you mix.
It should thicken up gradually.
Try freezing this custard, coating the surface with sugar and caramelizing the sugar using a blowtorch. It's transformed into a delicious crema Catalana!
Story Behind this Recipe
Basically, I didn't want to take the time to make custard cream, so I looked at various recipes and kept rearranging them! This quick custard cream can be used in apple pies, cream puffs, custard puddings, etc... If this custard cream is useful to you when you cook, I'd be so happy!
You can replace milk with heavy cream, but use less butter. If you substitute a small amount of the flour with cornstarch, and use vanilla beans instead of vanilla oil, you will get a rich and authentic tasting custard cream.