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auntlainey
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Whisk all ingredients except butter in a large bowl.
I usually make this ahead of time (a few hours or overnight) to let the ingredients meld together.
If you need to use it right away, I would sift the powdered sugar, and just make sure to whisk until it’s fully dissolved.
Whip butter on high until light and fluffy, about 3-5 minutes
Slowly pour egg white mixture into butter while mixer is still on high
Keep mixing until the mixture is fully integrated with the butter and a buttercream forms