2 cups milk 2 tablespoons cornstarch 1/3 cup white sugar 1 large egg 2 egg yolks 1/4 cup unsalted butter, cubed 1 teaspoon vanilla extract Whisk 1/3 of the cold milk and cornstarch together in a medium bowl until smooth. Pour remaining milk and sugar into a small saucepan. Heat over medium heat, stirring occasionally, until milk begins to simmer; remove from heat and set aside. Stir egg…