Swiss meringue buttercream is a silky, light frosting made by gently heating egg whites and sugar, then whipping them into a glossy meringue before adding butter. Using six egg whites creates a generous batch perfect for frosting cakes or cupcakes with a smooth, stable texture that’s less sweet than traditional buttercream but rich and creamy.
Ingredients
- 6 large egg whites, room temperature
- 1 1/2 cups (300g) granulated sugar
- 1 1/2 cups (340g) unsalted butter, softened and cut into cubes
- 1 teaspoon pure vanilla extract
- 1/4 teaspoon salt
Instructions
- Prepare a double boiler by filling a medium saucepan with about 2 inches of water and bringing it to a gentle simmer over medium heat.
- In a heatproof mixing bowl (preferably metal or glass), combine the egg whites and granulated sugar.
- Place the bowl over the simmering water, ensuring the bottom does not touch the water. Whisk continuously until the sugar is fully dissolved and the mixture reaches 160°F (71°C) on a candy thermometer. This usually takes 4–6 minutes. To test, rub a bit between your fingers—it should feel smooth, not gritty.
- Remove the bowl from heat. Using a stand mixer fitted with the whisk attachment (or a hand mixer), beat the egg white mixture on high speed until stiff, glossy peaks form and the bowl feels cool to the touch—about 8–10 minutes.
- With the mixer on medium speed, add the softened butter one tablespoon at a time. Incorporate each addition fully before adding the next. The mixture may look curdled or soupy at times; keep mixing and it will become smooth.
- Once all butter is incorporated, add vanilla extract and salt. Continue beating on medium-high speed until the buttercream is smooth, fluffy, and spreadable, about 3–5 more minutes.
- Use immediately to frost cakes or cupcakes, or store as directed below.
Tips
- Egg whites at room temperature: This helps them whip better and reach the right volume. If refrigerated, let them sit out for 30 minutes before starting.
- Softened butter: Use butter slightly softened but not melted. If butter is too cold, the mixture may curdle; if too warm, the buttercream can become too soft.
- Fixing curdled buttercream: If the buttercream looks broken or soupy, chill the bowl in the fridge for 10–15 minutes, then whip again. Alternatively, warm the bowl slightly and beat to re-emulsify.
- Flavor variations: You can easily swap vanilla for other extracts like almond or lemon, or add melted chocolate once the buttercream is smooth for a chocolate version.
Serving Suggestions
Swiss meringue buttercream is perfect for frosting layered cakes, cupcakes, and even cookies. Its silky texture pairs beautifully with butter cakes, vanilla, chocolate, or fruit-flavored desserts. Because it’s less sweet than traditional American buttercream, it balances well with tart fillings like raspberry or lemon curd. You can pipe it into elegant swirls or spread it smoothly with an offset spatula for a professional finish.
Variations
- Chocolate Swiss Meringue Buttercream: Add 4 ounces (115g) of melted, cooled dark chocolate after the butter is incorporated. Beat until smooth.
- Fruit-flavored: Substitute vanilla extract with 1–2 teaspoons of fruit extracts (e.g., strawberry, lemon) or fold in 2 tablespoons of fruit puree after the buttercream is made.
- Salted Caramel: Mix in 2–3 tablespoons of homemade or store-bought caramel sauce once the buttercream is smooth, adjusting salt to taste.
Storage and Reheating
Swiss meringue buttercream can be stored in an airtight container in the refrigerator for up to 5 days. Before using, bring it to room temperature and re-whip with a mixer to restore its fluffy texture. For longer storage, it freezes well for up to 2 months. Thaw overnight in the fridge and whip again before frosting.
Frequently Asked Questions
Can I use pasteurized egg whites for Swiss meringue buttercream?
Yes, pasteurized egg whites are safe and often preferred for Swiss meringue buttercream to reduce any risk of foodborne illness. Just ensure they are at room temperature before starting.
Why did my buttercream curdle and how do I fix it?
Curdling happens when the butter and meringue are at very different temperatures or if too much butter is added too quickly. To fix it, chill the bowl briefly and beat again or gently warm the bowl and continue mixing until smooth.
Can I make Swiss meringue buttercream ahead of time?
Absolutely! You can make it a day or two ahead and keep it refrigerated. Bring it to room temperature and re-whip before decorating. This helps save time on busy baking days.
Is Swiss meringue buttercream stable in warm weather?
Compared to American buttercream, Swiss meringue buttercream is lighter but less stable in heat because it contains more butter and less sugar. Keep it refrigerated until serving and avoid leaving it out for extended periods in warm conditions.
Can I substitute the butter with shortening or margarine?
While possible, substituting all butter with shortening or margarine will change the flavor and texture. Butter provides the rich taste and creaminess Swiss meringue buttercream is known for. If needed, a partial substitution can improve stability in warmer climates.
How do I get stiff peaks when whipping the meringue?
Ensure the egg whites and sugar mixture is heated to 160°F (71°C) to dissolve the sugar and slightly cook the egg whites. Use clean, grease-free equipment and beat on high speed until the mixture is glossy and holds stiff peaks, which may take 8–10 minutes.
By mastering this 6 egg white Swiss meringue buttercream, you gain a versatile frosting that’s both elegant and delicious, perfect for elevating any baked creation with a smooth, creamy finish.
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