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Mug Cake Frosting: Small Batch Buttercream Recipe

Need frosting for a mug cake but don’t want to make a full batch of buttercream? This Mug Cake Frosting is a perfect small-batch buttercream recipe.

Mug Cake Frosting Recipe

We love to make mug cakes at our house. They are so simple to throw together for a quick dessert, but my kids say it isn’t a cake without some frosting and sprinkles. I can’t say that I blame them. That is why I came up with this Mug Cake Frosting recipe, perfect for a small batch of frosting. It is just the right amount for a couple of mug cakes.


How to Make Mug Cake Frosting

Place all of the ingredients in a small mixing bowl and beat until fluffy. If you need, you can add more milk. If your frosting is too runny, add 1 tbsp of powdered sugar at a time until you reach the desired consistency.

This recipe makes 3/4 to 1 cup of frosting, depending on how much you whip it. That is a perfect amount for two mug cakes!

Flavor Variations

This frosting does not have to be only vanilla. Substitute your favorite flavorings to change it up a bit. Here are some suggestions


Mug Cake Frosting

A couple of tips to help your frosting turn out amazing.

  • Start with softened butter or butter substitute. It will give your frosting the best texture.
  • For a richer vanilla flavor, you can use a vanilla paste instead of vanilla extract.
  • Don’t have a piping bag? Put your frosting in a plastic zip-top bag and cut a corner off for a quick replacement.


This frosting is easy to make vegan. Use a Vegan butter substitute. I have had some great success with the Country Crock almond butter baking sticks lately.

Mug Cake Frosting

Need frosting for a mug cake but don't want to make a full batch of buttercream? This Mug Cake Frosting is a perfect small batch buttercream recipe.
Print Recipe
Prep Time:5 minutes
Total Time:5 minutes


  • 4 tablespoons unsalted butter softened, or vegan butter substitute
  • 1 cup powdered sugar sifted
  • 1 teaspoon milk or vegan milk substitute
  • 1/4 teaspoon vanilla extract
  • Pinch salt


  • In a medium bowl, beat softened butter until light and fluffy, 30 seconds to 1 minute. Add powdered sugar, 1 teaspoon of milk or cream, vanilla extract, and salt.
  • Beat until smooth. Add up to 2 additional teaspoons of milk until frosting reaches your desired consistency.
Servings: 2 servings
Author: Amanda Carlisle

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  1. 5 stars
    I LOVE frosting and was craving some to dip my 100 calorie pack of wafers in (kind of defeats the purpose, I know!!) This turned out great and I’ll have some for a few more nights too….if I can keep from digging in with a spoon of course!!!

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