Preparation Steps

• To make the custard, whisk together egg yolks, sugar, and cornstarch in a medium saucepan until smooth.
• Gradually whisk in the milk. Cook over medium heat, stirring constantly, until the mixture thickens and bubbles. Remove from heat.
• Stir in vanilla extract and butter until the butter is melted and incorporated. Pour the custard into a bowl, cover the surface with plastic wrap to prevent a skin from forming, and let it cool completely.
• To make the chocolate ganache, place the chopped chocolate in a heatproof bowl. Heat the heavy cream in a small saucepan until it just begins to simmer. Pour the hot cream over the chocolate and let it sit for 5 minutes. Whisk until smooth and glossy.
• To assemble the trifle, spread half of the doughnut pieces in the bottom of a trifle dish or individual serving glasses.
• Spoon half of the cooled custard over the doughnuts. Drizzle with half of the chocolate ganache.
• Repeat the layers with the remaining doughnuts, custard, and ganache.
• Chill the trifle for at least 30 minutes before serving. Garnish with chocolate shavings before serving.