Italian Meringue Buttercream Frosting (Printable)

A silky, luxurious frosting made by whipping butter into glossy Italian meringue for elegant cakes and desserts.

# What You'll Need:

→ Italian Meringue Base

01 - 1 cup granulated sugar
02 - 1/4 cup water
03 - 4 large egg whites, room temperature
04 - 1/4 teaspoon cream of tartar (optional)
05 - 1/8 teaspoon fine sea salt

→ Buttercream Finish

06 - 1 1/2 cups (3 sticks) unsalted butter, room temperature, cut into cubes
07 - 1 teaspoon vanilla extract

# Steps:

01 - Combine granulated sugar and water in a small saucepan over medium heat. Swirl gently until the sugar fully dissolves. Attach a candy thermometer and cook the syrup until it reaches 240°F (115°C).
02 - While the syrup heats, place egg whites, cream of tartar, and fine sea salt in a clean, grease-free stand mixer bowl fitted with a whisk attachment. Beat on medium speed until soft peaks form.
03 - Once the syrup reaches 240°F, slowly and carefully drizzle it into the whipping egg whites with the mixer running on medium-high speed. Pour along the side of the bowl and avoid contact with the whisk.
04 - Increase speed to high and continue whipping until the meringue holds stiff, glossy peaks and the mixer bowl feels completely cool to the touch, approximately 7 to 10 minutes.
05 - Reduce speed to medium and add the cubed butter a few pieces at a time, allowing each addition to fully blend before adding more. The mixture may appear curdled or soupy temporarily—continue mixing until it emulsifies into a silky, smooth buttercream, about 5 minutes.
06 - Pour in the vanilla extract and whip just until evenly combined. Use immediately or transfer to an airtight container.
07 - Frost cakes or cupcakes right away, or refrigerate covered for up to 5 days. Before using chilled buttercream, let it come to room temperature and re-whip until smooth.

# Expert Tips:

01 -
  • Once you master the technique, this buttercream makes every cake taste like it came from a professional bakery, and people will absolutely ask what you did differently.
  • The silky texture pipes beautifully and holds its shape at room temperature, which means no more sweating, sliding frosting disasters at parties.
02 -
  • A single drop of yolk or trace of grease in your bowl will prevent the egg whites from whipping properly, so wash everything with hot soapy water and wipe with vinegar if you want to be absolutely certain.
  • If the buttercream looks curdled and separated after all the butter is in, just keep the mixer running on medium high for another three to five minutes and it will almost always come back together into a perfect emulsion.
03 -
  • Use a digital candy thermometer rather than a dial one because precision at the syrup stage makes the difference between a buttercream that works and one that separates.
  • Cut your butter into uniform small cubes so each piece incorporates at the same rate, preventing those terrifying moments where the whole batch seems broken.

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