German Buttercream (Custard Buttercream)

German Buttercream is an ultra-silky, custard-based frosting made by whipping rich vanilla pastry cream (crème pâtissière) directly into creamed butter. Richer and more structural than Crème Mousseline, this butter-forward formula delivers an exceptionally smooth, melt-in-your-mouth mouthfeel with moderate sweetness, making it ideal for filling and finishing layer cakes.

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Planning

  • Prep Time:

    20 minutes

  • Bake/Cook Time:

    10 minutes

  • Chill/Set Time:

    1 hour

  • Servings:

    Frosts one 8-inch or 9-inch 3-layer cake, or 24 cupcakes

Preparation

  • Materials

    Stand mixer with paddle and whisk attachments
    Balloon hand whisk
    Heavy saucepan
    Mixing bowls
    Fine-mesh sieve
    Heatproof spatula
    Plastic wrap
    Digital thermometer

  • Prep

    Bring eggs and milk to room temperature before starting
    Soften unsalted butter to 68–70°F (20–21°C)
    Cut butter into uniform tablespoons for even creaming

  • Heat

    Cook the pastry cream over medium heat on the stovetop in a heavy saucepan

  • Shopping List

    Whole milk
    Large eggs (for yolks)
    Granulated sugar
    Cornstarch
    Unsalted butter
    Confectioners' sugar
    Pure vanilla extract or bean paste
    Salt

Method

  • Pastry Cream Base (Crème Pâtissière)

    Whole Milk: 480 ml (2 cups)
    Granulated Sugar: 150 g (3/4 cup)
    Egg Yolks: 60 g (~3 large yolks)
    Cornstarch: 40 g (1/4 cup)
    Fine Sea Salt: 1/4 tsp
    Pure Vanilla Extract or Paste: 5 g (1 tsp)

  • Pastry Cream Base (Crème Pâtissière)

    STEP 1: WHISK YOLKS, SUGAR AND STARCH
    In a heatproof mixing bowl, vigorously whisk together egg yolks, granulated sugar, cornstarch, and salt until pale, creamy, and ribbony (about 1–2 minutes).

    STEP 2: HEAT THE MILK
    In a heavy saucepan, bring whole milk to a gentle simmer over medium heat until small bubbles form around the perimeter (~185°F / 85°C). Remove from heat.

    STEP 3: TEMPER THE EGGS
    Slowly drizzle about 1/2 cup of the hot milk into the egg yolk mixture while whisking constantly to warm the eggs without scrambling them. Gradually whisk in the remaining hot milk until fully combined.

    STEP 4: COOK AND GELATINIZE
    Pour the mixture back into the saucepan through a fine-mesh sieve. Cook over medium heat, whisking constantly and scraping the bottom and corners of the pan. Once the custard begins to bubble, boil gently for 1 to 2 minutes while whisking continuously to fully cook the starch and activate thickening.

    STEP 5: STRAIN, FLAVOR AND COOL
    Remove from heat and stir in the 1 tsp vanilla extract. Strain through a fine-mesh sieve into a clean bowl. Press plastic wrap directly onto the surface of the pastry cream and cool to 68–70°F (20–21°C). (Both the butter and pastry cream must be at the same room temperature before mixing.)

Method

  • Buttercream Emulsion

    Unsalted Butter (Softened to 68–70°F): 460 g (2 cups / 1 lb)
    Confectioners’ Sugar (Sifted): 60 g (1/2 cup)
    Pure Vanilla Extract or Paste: 10 g (2 tsp)

  • Buttercream Emulsion

    STEP 1: CREAM BUTTER AND SUGAR
    In the stand mixer fitted with the paddle attachment, cream the softened butter and sifted confectioners' sugar on medium-high speed for 3 to 4 minutes until pale, light, and fluffy. Add the 2 tsp vanilla extract and beat until smooth. (Whipping generates friction and slightly warms the butter; verify it stays within 68–70°F before the next step.)

    STEP 2: EMULSIFY CUSTARD INTO BUTTER
    Switch to the whisk attachment and set the mixer to medium-low speed. Add the cooled pastry cream one tablespoon at a time, allowing each addition to fully incorporate before adding the next.

    STEP 3: FINAL AERATION
    Once all custard is added, scrape down the sides and bottom of the bowl. Whip on medium-high speed for 1 to 2 minutes until silky, pale, and glossy. Do not overbeat. Use immediately to fill and frost, or store refrigerated.

Putting it Together

  • Assembly

  • Notes

  •  Applications & Plating Pairings
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