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In a saucepan, whisk together the egg, sugar, and cornstarch until smooth.
Slowly pour in the milk, whisking constantly so no lumps form.
Place the saucepan over medium heat and cook, stirring continuously, until the mixture thickens and begins to bubble.
Once thick, remove from the heat and stir in the butter and vanilla until smooth.
Transfer the cream to a bowl and cover the surface to prevent a skin from forming. Let it cool completely before using.
This cream becomes smooth, glossy, and spoonable, perfect for cakes, layered desserts, or filling pastries. Bon appétit.