Easy Sugar Free Frosting (Keto Vanilla Buttercream)

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! 🧁

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
• 🥶 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 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).

🥶 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

Recipe