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image of lime buttercream being piped on top of a lime cupcake
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4.80 from 15 ratings

Lime Buttercream

This lime buttercream tastes just like summer! It has the perfect balance of sweet and tart & is packed w/ bright citrus flavor!
Prep Time8 minutes
Total Time57 minutes
Course: Frosting & Fillings
Cuisine: American
Servings: 3 cups
Calories: 970kcal

Ingredients

Lime Buttercream

  • 1 cup unsalted butter, room temperature 226g
  • zest of 1 small lime - about 2 tsp 4g
  • 1 tsp vanilla extract or vanilla bean paste 4g
  • 1/4 tsp fine salt 1g
  • 3 1/2 cups powdered sugar 454g or a 1 lb. box
  • 1 Tbsp fresh lime juice 15g

Instructions

Lime Buttercream:

  • Beat 1 cup of unsalted butter on a medium speed for 1 minute with a hand mixer until smooth.
  • Add in the zest of 1 small lime, 1 tsp vanilla extract, and 1/4 tsp salt. Mix on a low speed until the ingredients are incorporated. 
  • Mix in 3 1/2 cups of powdered sugar and 1 Tbsp of fresh lime juice on a low speed. Scrape the sides and bottom of the bowl as needed.
  • Once fully mixed, if the frosting seems too thick, add additional lime juice (1 tsp at a time). If the frosting is too thin, add more powdered sugar (quarter of a cup at a time).
  • If your frosting looks broken, add in more room-temperature butter, 1 Tbsp at a time until it comes back together.
  • Stir the frosting by hand with a rubber spatula once it's made for a minute or two to make the frosting super smooth.
  • Either cover the frosting flush with plastic wrap to prevent crusting or place it in a piping bag fitted with your favorite frosting tip. This buttercream can sit at room temperature for a day, be stored in the fridge for up to a month in an airtight container, or be stored in the freezer for 3 months.

Video

Notes

Yield

This recipe makes about 3 cups of frosting. If needed, this recipe can be halved, doubled, or tripled. A triple batch will fit/can be made in a 5 qt Kitchen Aid Mixing bowl.
I usually make 1 batch to frost a dozen cupcakes with large swirls. I make 2 batches to fill and frost a seven- or eight-inch layer cake.

Tips for Making the Best Lime Buttercream

  • Make sure your butter is at room temperature before making your frosting.
  • If your powdered sugar contains cornstarch (most brands in the US do) there's no need to sift the powdered sugar.
  • Use fresh lime juice and zest! It will give this frosting the best flavor.
  • If you are making frosting for a cake, mix the buttercream on the lowest speed at the end of the process for a couple of minutes to get out any extra air that might have been incorporated during the mixing process.

Making This Lime Buttercream in Advance and Storage Tips

  • Make this frosting ahead of time or save any leftover frosting! It can be stored in an airtight container in the fridge for up to a month.
  • This frosting can also be stored in the freezer for up to 3 months! Just be sure to give it a good stir once it thaws to make it nice and smooth again.
  • A frosted cake can last in the fridge for a week or in the freezer for a month. The buttercream locks in the moisture and keeps the cake fresh and delicious!

Nutrition

Serving: 1 | Calories: 970kcal | Carbohydrates: 74g | Protein: 1g | Fat: 77g | Saturated Fat: 48g | Polyunsaturated Fat: 25g | Cholesterol: 203mg | Sodium: 206mg | Sugar: 72g