Introduction

Chocolate Swiss Meringue Buttercream is a silky, smooth frosting that’s both rich and light. Perfect for cakes and cupcakes, it blends the sweetness of buttercream with the deep flavor of chocolate in an elegant way.

A thick, smooth swirl of rich, dark brown chocolate frosting fills a white bowl, with creamy, soft peaks and waves creating a textured surface that looks glossy and airy. The frosting is piled high with visible spatula marks that form natural curves and folds, giving a sense of depth and lightness. The bowl sits on a white marbled surface that adds a clean and bright contrast to the deep chocolate color. photo taken with an iphone --ar 4:5 --v 7

Ingredients

2/3 cup (133 grams) granulated sugar
4 large egg whites*
1/4 teaspoon fine sea salt
3 sticks (340 grams) unsalted butter, cut into 12 pieces and at room temperature
12 ounces (340 grams) semisweet chocolate, melted and cooled to room temperature
1 teaspoon vanilla extract

Instructions

Step 1: Combine the sugar, egg whites, and salt in the bowl of a stand mixer. Set the bowl over a saucepan with 1 inch of gently simmering water. Whisk gently and constantly until the sugar dissolves and the mixture thickens and becomes foamy. It should reach 160°F on a candy or digital thermometer, about 3 minutes. Remove from heat and wipe the bottom of the bowl dry.
Step 2: Attach the bowl to the mixer fitted with the whisk attachment. Whip the meringue until it is thick, glossy, and forms stiff peaks. The bowl should no longer feel warm to the touch. This takes about 7 to 10 minutes.
Step 3: Switch to the paddle attachment and, with the mixer on low speed, add the butter cubes one at a time until fully incorporated. Continue beating until the mixture reaches a silky smooth texture, which may take several minutes.
Step 4: If the buttercream curdles, keep mixing and it will come back together. If it’s too thin or runny, refrigerate for about 15 minutes, then continue mixing with the paddle attachment until smooth.
Step 5: Add the cooled melted chocolate and vanilla extract. Mix until combined, then increase the speed to medium-high and beat until light, fluffy, and well combined, about 30 seconds. Scrape down the sides and bottom of the bowl as needed.

Tips & Variations

Use room-temperature butter for easier incorporation and a smoother texture.
If your buttercream curdles, patience is key—keep beating and it will come together.
Try swapping semisweet chocolate for dark or milk chocolate to adjust richness and sweetness.
For a flavored twist, add a tablespoon of espresso powder or a splash of liqueur with the vanilla extract.

Storage

Store the buttercream in an airtight container in the refrigerator for up to 5 days or freeze for up to 2 months. Before using, bring to room temperature and beat on low speed until creamy. If the frosting appears runny or curdled, microwave about 1/4 cup for 5-10 seconds, then mix back into the bowl and beat on medium-high until smooth.

How to Serve

The image shows a close-up of smooth, creamy chocolate frosting swirling inside a white bowl. The frosting is thick and glossy with a rich brown color, filling the bowl almost to the rim. The swirls create textured patterns, with soft peaks and ridges visible, showing its light and airy texture. The white marbled background contrasts with the dark chocolate frosting, making it stand out. photo taken with an iphone --ar 4:5 --v 7

Serve this delicious recipe with your favorite sides.

FAQs

Can I use pasteurized egg whites instead of fresh raw egg whites?

Yes, pasteurized egg whites are safe and work well in this recipe as they reduce the risk of foodborne illness without affecting the texture.

What should I do if my buttercream is too stiff or too soft?

If the buttercream is too stiff, you can soften it by mixing in a little milk or cream. If it’s too soft, chill it briefly and then whip it again until smooth and fluffy.