In the bowl of a stand mixer fitted with the paddle attachment, add all of the ingredients except for the lime juice. Begin mixing the ingredients on the lowest speed until the powdered sugar is at least halfway incorporated. If you increase your speed right away, the powdered sugar will fly out of the bowl. Once the powdered sugar is halfway incorporated, increase speed to medium and mix for 1 minute before increasing to high. Let mix on high for at least 3 minutes.
Once your buttercream has come together and is smooth, determine if the consistency is to your liking. If it is too thick, you may add lime juice, 1 tablespoon at a time, whipping well in between. The longer you whip your frosting, the more air will be incorporated and the fluffier it will be. Once you have achieved a good consistency, let it whip for 2 more minutes. Spread onto cupcakes or cake and serve! We love using this buttercream on our Strawberry Margarita Cupcakes!
2 tablespoons lime juice
Notes
Make sure that your butter is at room temperature before making this frosting. It will result in a smoother finish and will be easier to combine.
Start your mixer on low speed. If you start it on high it will cause the powdered sugar to cover your kitchen!
Storage: Store buttercream in an airtight container or Ziplock bag in the refrigerator for up to 1 week or in the freezer for up to 3 months.