Crème Mousseline (German Buttercream)

Ingredients

• Hide ingredients for Pastry Cream, using an extra ¼ cup sugar 1 Pastry Cream, using an extra ¼ cup sugar (opens in new tab) Pastry Cream, using an extra ¼ cup sugar
  • ½ cup sugar
  • 2 tablespoons cornstarch
  • 3 large egg yolks
  • 1 large egg
  • ¼ teaspoon salt
  • 1 ½ cups whole milk
  • (1 vanilla bean, split lengthwise)
  • 2 tablespoons cold unsalted butter, cut into small pieces
  • (1 teaspoon vanilla)

  Sub-recipe steps

  1. Whisk together in a medium heatproof bowl until smooth: ½ cup sugar; 2 tablespoons cornstarch; 3 large egg yolks; 1 large egg; ¼ teaspoon salt
  2. Bring to a simmer in a medium saucepan: 1 ½ cups whole milk; (1 vanilla bean, split lengthwise)
  3. If using, remove the vanilla bean and set aside. Slowly pour half the hot milk over the egg mixture while whisking it constantly. Whisk the tempered egg mixture into the saucepan with the remaining milk and cook, stirring constantly, over medium-low heat until the cream thickens, about 2 minutes. Immediately scrape the custard into a clean bowl and stir in: 2 tablespoons cold unsalted butter, cut into small pieces
  4. If you used a vanilla bean, scrape the seeds from the pod and stir into the pastry cream. If you did not use vanilla bean, stir in, if desired: (1 teaspoon vanilla)
  5. Place a piece of plastic wrap directly on the surface of the pastry cream to prevent a skin from forming. Let cool, then refrigerate before using. This keeps, refrigerated, for up to 2 days. When ready to use, transfer the pastry cream to a bowl, or a stand mixer with the paddle attachment, and beat on low speed until smooth and creamy.
• 2 sticks (8 ounces) unsalted butter, softened