Swiss Meringue Buttercream (SMBC) is often considered the ultimate frosting for its smooth, velvety texture and less sweetness compared to traditional American buttercream. Made by whipping egg whites and sugar into a meringue, then adding butter and flavoring, it results in a frosting that’s not only beautifully smooth but also stable enough for intricate piping and cake decorating.
It’s perfect for wedding cakes, cupcakes, or any other dessert that needs a fluffy, melt-in-your-mouth texture.
Ingredients (Makes enough to frost an 8-inch cake or 24 cupcakes)
- Egg whites – 150 g (5 large egg whites)
- Granulated sugar – 200 g (1 cup)
- Unsalted butter (softened, cubed) – 340 g (1 ½ cups)
- Vanilla extract – 2 tsp
- Salt – ¼ tsp
Optional Additions for Extra Flavor:
- Espresso powder – 1 tsp (for a mocha version)
- Melted chocolate – 60 g (for a rich chocolate version)
- Fruit puree – 3 tbsp (for berry or citrus flavors)
- Caramel sauce – 2 tbsp (for a caramel buttercream)
Step-by-Step Instructions
Step 1: Heat the Egg Whites & Sugar
- Combine the egg whites and sugar in a heatproof bowl.
- Place the bowl over a pot of simmering water (double boiler method).
- Whisk constantly until the mixture reaches 70°C (160°F) and the sugar dissolves completely.
- Check by rubbing a small amount between your fingers – it should feel smooth, not grainy.
Step 2: Whip the Meringue
- Transfer the egg-white mixture to a stand mixer with the whisk attachment.
- Beat on high speed for 8-10 minutes until the mixture forms stiff, glossy peaks and has cooled to room temperature.
Step 3: Add the Butter
- Once the meringue has cooled, start adding the softened butter one cube at a time, mixing on medium speed.
- Continue mixing until the frosting is smooth and creamy. Don’t worry if it looks curdled at first – it will come together with more mixing.
Step 4: Flavor & Final Mix
- Add the vanilla extract and salt, mixing on low speed to incorporate.
- If the frosting is too soft, you can chill it briefly and rewhip to firm it up.
- Your Swiss meringue buttercream is now ready to use!
How to Use Swiss Meringue Buttercream
✔ Frosting Cakes – Perfect for layered cakes, especially wedding cakes.
✔ Piping on Cupcakes – Holds its shape beautifully and pipes into stunning swirls.
✔ Macaron Filling – Light and smooth for sandwiching macaron shells.
✔ Pastry Filling – Ideal for cream puffs or éclairs.
Nutrition Information (Per Serving – Based on 24 Servings)
- Calories: 180 kcal
- Protein: 1.5 g
- Fat: 16 g
- Carbohydrates: 12 g
- Sugar: 12 g
- Sodium: 20 mg
Tips & Tricks for Perfect Swiss Meringue Buttercream
✔ Use Fresh, Room Temperature Eggs – This helps the meringue whip up properly.
✔ Ensure the Meringue is Cool – The meringue should not be warm when adding the butter, or the frosting could separate.
✔ Don’t Overmix – Once the frosting is smooth, stop mixing to prevent it from becoming too soft.
✔ Chill if Necessary – If the buttercream is too soft to pipe, chill it in the fridge for 15 minutes, then rewhip.
✔ Flavor Variations – Add chocolate, fruit puree, or flavor extracts for a unique twist.
Extra Additions for More Flavor
- Chocolate Swiss Meringue Buttercream – Mix in melted dark chocolate for a richer flavor.
- Strawberry Swiss Meringue Buttercream – Fold in 3 tbsp strawberry puree for a fruity twist.
- Salted Caramel Buttercream – Drizzle in 2 tbsp caramel sauce for a smooth, buttery flavor.
- Lemon Swiss Meringue Buttercream – Add zest and juice for a tangy finish.
Make-Ahead & Storage Tips
- Refrigerate: Store in an airtight container in the fridge for up to 5 days.
- Freeze: Freeze in a freezer-safe container for up to 3 months. Thaw overnight in the fridge before rewhipping.
- Rewhip Before Using: If the buttercream is cold, let it come to room temperature and rewhip for 2 minutes to restore the texture.
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