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Mix the Base: In a saucepan, whisk together the egg, sugar, cornstarch, and vanilla sugar until smooth.
Add Milk: Slowly pour in the milk while whisking to avoid lumps.
Cook: Place the pan over medium heat and stir constantly until the mixture thickens (about 3–5 minutes).
Add Butter: Once thick, remove from heat and stir in the butter until fully melted and glossy.
Serve: Pour into serving cups and let cool slightly. Enjoy warm or chilled!
Serving and Storage Tips
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