My buttercream kept splitting until I tried something with the mixer speed

I was making a big batch of Swiss meringue buttercream for a wedding cake last Friday, and it kept turning into a greasy mess after adding the butter. I read online to try warming the bowl slightly, but that didn't help. On my third try, I stopped the mixer completely and let the whole bowl sit at room temp for about 15 minutes. Then I started mixing again on the lowest speed, and it came together perfectly in under a minute. Has anyone else found that just letting it rest fixes a split frosting?

3 comments

3 Comments

victor_carr252mo ago

Oh totally, the rest period is key! I had the same thing happen with American buttercream last month when my kitchen was too warm. It looked curdled and oily no matter how long I mixed. I turned the mixer off, walked away for like 20 minutes, and then started on low. It smoothed right out. I guess it lets the butter firm up just enough so it can emulsify properly. That low speed trick at the end is a lifesaver.

tarajenkins2mo ago

My friend had that exact issue last week and @victor_carr25's advice about the rest period totally saved her cake.

noah_webb1mo ago

Yeah but I gotta disagree with the "walk away for 20 minutes" thing... that only works if your butter was already too soft to begin with. I've had cakes where the buttercream looked fine, then I left it alone for 10 minutes and came back to a greasy, separated mess because the butter actually firmed up too much and wouldn't re-emulsify. Low speed saved it for me once but it took like 45 minutes of babysitting on low instead of just catching the problem early. The rest period trick feels like a bandaid for bad temperature control rather than a real fix...