This buttercream frosting is silky smooth and perfectly pipe-able. It is hands down the best sugar free frosting I’ve ever made and is worth the effort. Up your keto baking game with this amazing vanilla buttercream recipe. And it’s virtually carb free!
Servings: 16 | Net Carbs: .01 yes!
WHAT IS SWISS MERINGUE BUTTERCREAM?
Swiss meringue is perhaps one of the most beloved frosting of professional bakers. It has an incomparable silky consistency and sweet buttery flavor, without being as tooth-achingly sweet as the standard American frosting.
It’s called “meringue” because it involves using egg whites to get a lighter, fluffier consistency. They are combined with sugar (or in our case, sweetener) and then gently warmed over a double boiler until the sweetener dissolves. Then they are whisked to stiff peaks.
You then add cubes of room temperature butter, which deflates the egg whites. For once, you actually want to deflate the egg whites so don’t panic! Once the whites and the butter are full combined, you truly have the most amazing silky frosting which pipes and spreads so well.
It also uses far less sugar or sweetener. A typical American buttercream will use upwards of 2 cups of powdered sugar, just to have the right structure. In many of my sugar free frosting recipes, I’ve gotten around this by using a little cream cheese to give it some structure without copious amounts of expensive sweeteners.
But this recipe for keto Swiss meringue buttercream uses less than a full cup of sweetener in the whole batch. And it’s enough to frost a 9 inch layer cake or about 18 cupcakes!
Ingredients:
- 4 large egg whites
- ½ cup powdered Swerve Sweetener
- ⅓ cup Bocha Sweet (allulose or xylitol may also work)
- 1 cup unsalted butter, room temperature cut into tablespoons
- 1 teaspoon vanilla extract
- ¼ teaspoon salt
Instructions:
Make sure the bowl of a stand mixer is very clean and set over a pan of barely simmering water. Add egg whites and both sweeteners.
Whisk gently but constantly, until the sweeteners have dissolved and egg whites are hot and slightly frothy. They should reach about 150F on an instant read thermometer.
Transfer the bowl to the mixer and attach the whisk. Whip the egg whites at medium high speed until they are thick and glossy and the bottom of the bowl is no longer warm, anywhere between 5 and 10 minutes. The temperature should be about 90F on an instant read thermometer.
Start adding the butter cubes one at a time until full incorporated and the frosting is smooth and creamy. Turn stand mixer to medium low and add the vanilla and salt until combined.
Spread or pipe on your favorite keto cakes and cupcakes! This frosting also freezes really well. Let it come to room temperature again and rewhip lightly before frosting.
NOTE: You need the two different sweeteners here! A combination of an erythritol based sweetener, such as Swerve, and one that keeps things softer, such as Bocha Sweet, xylitol, or possibly allulose, is necessary to achieve the correct consistency.
How to rescue sugar-free Swiss Meringue Buttercream:
Curdled frosting: If the frosting has little lumps of butter, it means it's a bit too cold to fully incorporate together. Simply sit the bowl over the pan of water and rewarm very gently. Once it's looking a bit melted around the edges, put it back on your stand mixer and turn it on low. Slowly increase the speed and whip it until it comes together.
Soupy frosting: If the buttercream is thin and liquidy, it means it's too warm. Refrigerate for 10 to 20 minutes, until it's hardened around the edges but still soupy in the middle. Then whip until it thickens and firms up.
Source: All Day I Dream About Food
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