In a bowl, whisk the egg, sugar, and vanilla sugar until smooth.
In a separate bowl, mix the cornstarch with a little water to make a slurry.
Combine the egg mixture and cornstarch slurry in a saucepan over medium heat.
Stir constantly until the mixture thickens, about 3-4 minutes.
Remove from heat and let it cool slightly before serving. Enjoy your quick and creamy dessert!
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