Buttercreams: American, Swiss Meringue, and Italian Meringue

What Is Buttercream?

Buttercream is a fat-enriched frosting used to fill, crumb-coat, and finish cakes. The three types you will produce in this lesson — American, Swiss meringue, and Italian meringue — differ in how they are built, their texture, stability, and the situations in which each works best. Understanding those differences is central to both the ACF Certified Fundamentals Pastry credential and the RBA Certification.

American Buttercream

American buttercream is the simplest of the three. It is made by creaming softened unsalted butter with sifted powdered (confectioners') sugar, then adding a small amount of liquid — usually milk, cream, or vanilla extract — to adjust consistency. No heat is applied, and no egg whites are used.

Characteristics: Sweet, dense, and very stable at room temperature. The high sugar content means it crusts on the surface after a short rest, which actually helps with smooth finishing.

Use cases: Grocery-store decorated cakes, children's birthday cakes, cupcakes, any setting where the cake will sit at room temperature for an extended period, and any time a beginner-friendly, forgiving frosting is needed.

Ratio guidance: A common starting ratio is roughly 1 part butter to 2 parts powdered sugar by weight, adjusted with liquid for spreadability. (Your instructor will give the exact batch formula for lab.)

Safety note: Because no raw egg whites are involved, American buttercream carries minimal food-safety risk beyond standard sanitation — keep tools clean, and refrigerate finished cakes if held longer than two hours.

Swiss Meringue Buttercream

Swiss meringue buttercream begins with a cooked meringue. Egg whites and granulated sugar are combined and warmed together over a bain-marie (a bowl set over simmering water) while being stirred constantly. The mixture must reach 160 °F (71 °C) as measured with a calibrated instant-read thermometer. Reaching this temperature pasteurizes the egg whites, eliminating the risk from Salmonella and other pathogens that can be present in raw shell eggs.

Once the whites hit 160 °F, the bowl is moved to the mixer and whipped on high speed until the meringue is glossy, stiff, and the bowl feels cool to the touch. Softened butter is then added a tablespoon at a time with the mixer running. The mixture may look curdled or soupy as butter is added — this is normal. Continue beating; it will come together into a silky, smooth cream.

Characteristics: Less sweet than American buttercream, silky texture, light sheen. Holds fine detail well. Slightly less stable at warm room temperature than American buttercream.

Use cases: Wedding cakes, layer cakes where a less-sweet profile is preferred, cakes served in a climate-controlled venue.

Critical safety point: The instructor will verify and log each group's egg-white temperature on the instructor log before buttercream is built. Do not proceed to the butter-addition stage until 160 °F is confirmed. Use a calibrated instant-read thermometer — not just the bain-marie water temperature — to check the whites directly.

Italian Meringue Buttercream

Italian meringue buttercream uses a different pasteurization method. Egg whites begin whipping in the mixer while a separate sugar syrup is cooked on the stovetop. The syrup is cooked to the soft-ball to firm-ball stage (commonly cited around 240–248 °F / 115–120 °C). The hot syrup is then poured in a slow, steady stream down the inside of the mixer bowl into the whipping whites with the mixer running. The heat of the syrup cooks and stabilizes the whites as they whip. The meringue is beaten until cool, and then softened butter is incorporated the same way as in Swiss meringue buttercream.

Characteristics: Very stable, satiny finish, less sweet than American, similar to Swiss in flavor profile. Slightly more involved because you are managing two processes simultaneously.

Use cases: High-volume bakery production, wedding cakes, cakes that need to hold up in moderately warm conditions longer than Swiss meringue buttercream will.

Safety notes for Italian method: Hot sugar syrup can cause severe burns. Pour the syrup slowly and carefully down the inside edge of the bowl, not directly onto the whisk, to avoid splatter. Keep your face and hands clear. Use heat-resistant gloves when handling the saucepan. If sugar crystallizes on the pan sides, do not scrape it into the syrup.

Finishing: Crumb Coat and Final Coat

Regardless of buttercream type, a two-stage application gives the cleanest result.

1. Crumb coat: Apply a thin layer of buttercream over the entire cake to seal in crumbs. Refrigerate or let it set briefly until firm.

2. Final coat: Apply a fuller layer and use a bench scraper held perpendicular to the turntable to smooth the sides while spinning the cake. Use an offset spatula to pull excess from the top toward the center.

A flat, sharp-edged finish comes from consistent pressure on the bench scraper, working in one smooth rotation, and chilling between passes if needed.

General Safety and Sanitation

• Wash hands before starting and after handling raw eggs.
• Keep all equipment sanitized; buttercreams contain dairy and egg and support bacterial growth.
• Store finished buttercreams covered and refrigerated if not used immediately; re-whip after bringing back to room temperature.
• When using the bain-marie, be careful of steam burns — use dry towels or oven mitts when handling the bowl.
• Report any equipment issues with the planetary mixer to the instructor before operating.