Key Lime Buttercream Frosting

I used this frosting in my Key Lime Cake post, which I recommend that you check out as well. Enjoy!


  • 1/2 cup butter (1 stick/8 tbsp)
  • 4 cups powdered/icing/confectioner’s sugar
  • 1 1/2 tsp vanilla extract
  • 1 to 2 tbs milk, in case frosting becomes too thick
  • Lime juice and zest to taste


To a large bowl, add one stick of butter. Use a mixer to beat this until it is a pale yellow, or light and fluffy. It may stick to the beaters during this process.

Add in vanilla extract, 1 tablespoon of lime juice, and lime zest, and mix well.

Add in 1/2 a cup of powdered/confectioners/icing sugar, mixing well, then add in another 1/2 cup. Repeat this until you have added in all 4 cups. Continue to test the buttercream, adding in lime juice to taste. You can add in a tablespoon of milk if the frosting becomes too thick, but you do not want the frosting to be too runny.

Use to top, cover, or decorate your cakes/cupcakes in any way you’d like.


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