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    Home > Blog > Protein Desserts > Protein Frostings

    Easy Sugar Free Frosting (Keto Vanilla Buttercream)

    Updated: Aug 18, 2022 · Published: Oct 27, 2021 · By Andréa Marchese · This post may contain affiliate links · Leave a Comment

    Jump to Recipe Print Recipe

    Perfect for your keto and protein cake creations, this easy sugar free frosting is a great vanilla buttercream that can stand up to layer cakes and piping. Happy frosting! 🧁

    slice of frosted 3 layer cake being pulled out with a cake server, with a grey background
    Easy Sugar Free Frosting (Keto Vanilla Buttercream) used in a Keto Protein Birthday Cake

    The secret ingredient in this frosting is casein protein powder. The casein thickens up the frosting, which helps it hold up with layer cakes and piping without over-sweetening the frosting.

    If you like this recipe, you may also enjoy our Peanut Butter Cream Cheese Frosting, Healthy Chocolate Frosting, and Cashew Whipped Cream.

    And if you need a cake recipe to go with this easy sugar free frosting, check out our Keto Protein Birthday Cake (pictured above).

    Jump to:
    • 🧁 Ingredients
    • 👩🏼‍🍳 Instructions
    • 🥣 Substitutions
    • 🥄 Equipment
    • 🥶 Storage
    • 🧁 More frosting and topping recipes
    • 🥣 Recipe

    🧁 Ingredients

    • Butter (unsalted)
    • Shortening (we suggest Spectrum Organic)
    • Confectioners erythritol (we used Swerve here, but Anthony's is also great)
    • Alcohol-free vanilla extract or a good quality vanilla extract with alcohol, like this Bourbon vanilla (lesser quality alcohol-based vanilla extract can give a bad alcohol taste in unbaked recipes)
    • Casein protein powder (optional, but it helps thicken the frosting)

    👩🏼‍🍳 Instructions

    Beat the butter, shortening, and vanilla on medium-high speed until smooth (scrape down the sides as necessary).

    Beat on low speed as you add the confectioners erythritol and casein. Then on high until light and fluffy (a few minutes).

    That's it! I told you it was easy. :)

    🥣 Substitutions

    Feel free to use all butter or all shortening (or vegan butter replacement).

    🥄 Equipment

    You'll need a mixer. I used this reasonably priced stand mixer, but a hand mixer would work just as well. If you need mixing bowls, I love this set of mixing bowls from Target.

    It would also be helpful to have a rubber spatula to get all the frosting out of the bowl.

    For piping, these are my favorite piping bags. They are made of a smooth plastic that doesn't stick to itself or to your bowl scraper as you push the frosting down the bag.

    And I always suggest measuring your ingredients with a kitchen scale instead of using volume measurements.

    🥶 Storage

    Store the frosting in the refrigerator in an air-tight container and bring to room temperature before using. You may want to mix it again for a couple of minutes before frosting your cake.

    🧁 More frosting and topping recipes

    • Cream Cheese Protein Frosting
    • Healthy Chocolate Frosting
    • Peanut Butter Cream Cheese Frosting (Without Powdered Sugar)
    • Cashew Whipped Cream

    🥣 Recipe

    slice of frosted 3 layer cake being pulled out with a cake server, with a grey background

    Easy Sugar Free Frosting (Keto Vanilla Buttercream)

    makes enough to frost one 8" cake or 12 cupcakes.
    Print Recipe Pin Recipe Rate Recipe
    Prep Time: 3 minutes
    Servings: 12
    Calories: 144kcal
    Author: Andréa Marchese

    Equipment

    • stand mixer
    • hand mixer
    • mixing bowl
    • rubber spatula
    • piping bags
    • bowl scraper

    Ingredients

    • 1 ½ sticks butter (¾ cup)
    • ¼ cup shortening (we suggest Spectrum Organic Shortening)
    • 2 tablespoons alcohol free vanilla extract or a good Bourbon vanilla
    • 1 ½ cups confectioners erythritol (we used Swerve, but Anthony's confectioners erythritol is also great)
    • 1 ½ tablespoons casein protein powder

    Instructions

    • Beat the butter, shortening, and vanilla on medium-high speed until smooth (scrape down the sides as necessary).
    • Beat on low speed as you add the confectioners erythritol and casein. Then on high until light and fluffy (a few minutes).

    Notes

    Store the frosting in the refrigerator in an air-tight container and bring to room temperature before using. You may want to mix it again for a couple of minutes before frosting your cake.

    Nutrition

    Serving: 2tablespoons (approx) or 1/12 recipe | Calories: 144kcal | Carbohydrates: 18g | Protein: 1g | Fat: 14g | Erythritol: 18g
    Tried this recipe?Mention and tag us! @proteincakery

    More Protein Frosting Recipes

    • Raspberry Cheesecake Mousse
    • Pumpkin Protein Cake with Cream Cheese Protein Frosting
    • Keto Pumpkin Cheesecake Mousse
    • Protein Cupcakes - Fluffy and Delicious!

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    andrea at the gym holding cupcakes

    Hi, I'm Andréa! I love baking, coffee, and leg day. Baking with protein powder has helped me develop healthy habits and overcome disordered eating, and I love sharing the recipes I've created.

    More about me →

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