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    Home » Keto Cakes » Keto Marble Cake

    Published: Jan 5, 2020 · Modified: Jan 9, 2021 by Carolyn

    Keto Marble Cake

    This post may contain Amazon or other affiliate links. As an Amazon Associate I earn from qualifying purchases.

    3.8K shares
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    Keto marble cake doesn’t get any better than this! Two layers of low carb vanilla and chocolate cake swirled together, with a silky smooth low carb chocolate frosting. A perfect keto birthday cake recipe. This post is sponsored by Bob’s Red Mill.

    A slice of keto marble cake on a white plate, with the rest of the cake in the background.

    I am currently obsessed with gorgeous layer cakes. Not so much with eating them, although of course I enjoy that too. But with creating them, and with finding ways to take keto cake baking to new heights. It’s just ever so satisfying and amazing when I can create a keto birthday cake like this one and have it rival any high carb, high sugar recipe.

    This keto marble cake is something I created for my daughter’s birthday, and it is spectacular, if I do say so myself. The cake alone is delicious, but then I topped it all off with a chocolate version of my sugar-free Swiss Meringue Buttercream. And my decorating wasn’t half bad either, this time around!

    Piping sugar-free chocolate buttercream onto a keto birthday cake.

    Marble Cake Recipe Inspiraton

    I have made a few keto marble cake recipes, including a peanut butter marble bundt cake, and a marble loaf cake.

    But after spotting a few gorgeous marble layer cakes on Pinterest, including this one from Baking a Moment, I just had to try my hand at a keto version. Allie is an talented pastry chef that I’ve known online for years now, and her recipes are always simply gorgeous. So I sweet-talked my daughter into letting me make this for her 13th birthday.

    One of the tricks I learned from this recipe was incredibly helpful, and that was to mix the cocoa powder with hot water before creating the chocolate batter. Heretofore, I’ve always just added the cocoa powder straight into the vanilla batter, which makes it incredibly thick and harder to work with.

    I also knew I wanted Chocolate Swiss Meringue Buttercream for the frosting. I can’t tell you just how amazing Swiss Meringue is compared to regular buttercream. It’s so silky smooth, and so easy piped, it’s ideal for cake decorating. While my classic keto chocolate frosting is easier to make, it isn’t quite the same.

    Removing a slice of keto birthday cake from the rest of the cake.

    How to make Marble Cake

    It isn’t difficult to make a keto marble cake but it does take a bit more effort than some cakes – and it’s worth it. It’s a fun one to bake and looks particularly amazing when you slice into it. Here are a few pointers to getting it perfect.

    Which keto flour?

    I used all almond flour for this cake recipe, so it’s entirely coconut-free for those of you who are allergic or simply don’t like coconut. However, I know some of you will ask how it can be made with coconut flour instead. Please understand that this is not a direct exchange.

    For a nut free version, I recommend following my keto coconut flour cupcakes recipe, and using hemp milk or dairy milk in place of the almond flour. Then proceed to add the cocoa powder and water as you would in the recipe here.

    Adding protein powder

    This is an important ingredient, as it replaces gluten and helps the cake rise and hold its shape. You can use egg white protein in place of the whey, if you prefer. But please do not use collagen or bone broth protein, as it makes baked goods gummy and hard to cook through.

    Always line your pans with parchment

    Trust me, it will save you so much grief! Even if your cake layers stick a bit to the sides of your pans, you can still run a sharp knife around them to get them out. But parchment liners will keep the cake from sticking to the bottoms, and you will be able to get them out in one piece.

    To cut down on prep, I highly recommend these parchment circles for your cake pans.

    How to marble the batter

    Keto cake batter is always thicker than conventional batters, so marbling them nicely is a bit trickier. I recommend add the batters in small alternating dollops, about 2 tablespoons at a time. Once you have one layer in the pan, swirl it together with a knife, lifting sometimes from the bottom to mix them up more. Then smooth the top as best you can.

    How to make Chocolate Swiss Buttercream

    I promise it’s not as difficult as it seems at first. It’s actually remarkably forgiving too. Simply follow the steps for my sugar-free swiss buttercream and simply drizzle in melted dark chocolate toward the end.

    I did find that at first my buttercream was too soft to spread on the cake so I placed it the whole bowl in the fridge for 10 minutes to firm it up a bit.

    How to decorate a keto marble cake

    Now for the fun part! I held back some of my frosting so that I could pipe pretty rosettes onto the top of the cake. Then I topped each rosette with a mini keto chocolate chip cookie.

    But you could also add some fun sugar-free sprinkles instead. Or simply shave some sugar-free dark chocolate overtop. Have some fun with it!

    Close up shot of keto marble cake on a white plate, on top of a pale green napkin.

    More Amazing Keto Layer Cakes

    • Keto Caramel Cake
    • Keto Italian Cream Cake
    • Keto Victoria Sponge Cake
    • Classic Carrot Cake with Ginger Cream Cheese Frosting
    • Low Carb Zucchini Layer Cake
    • Keto Tiramisu Layer Cake

    Marble Layer Cake

    Keto marble cake doesn't get any better than this! Two layers of low carb vanilla and chocolate cake swirled together, with a silky smooth low carb chocolate frosting. A perfect keto birthday cake recipe.
    4.73 from 11 votes
    Print Pin Rate
    Course: Dessert
    Cuisine: American
    Keyword: keto birthday cake, marble cake, marble cake recipe
    Prep Time: 40 minutes
    Cook Time: 40 minutes
    Total Time: 1 hour 20 minutes
    Servings: 16 servings
    Calories: 267kcal

    Ingredients

    Cake

    • 3 cups almond flour
    • ⅓ cup whey protein powder
    • 1 tablespoon baking powder
    • ¼ teaspoon salt
    • ½ cup sour cream
    • ¾ cup Swerve Sweetener
    • 3 large eggs room temperature
    • 2 tsp vanilla extract
    • ½ cup unsweetened almond milk
    • ⅓ cup cocoa powder
    • ⅓ cup hot water

    Chocolate Swiss Buttercream

    • 4 ounces sugar-free dark chocolate chopped
    • 1 recipe Swiss Meringue Buttercream

    Instructions

    • Preheat the oven to 325F and grease 2 8-inch round baking pans. Line the bottoms of the pans with parchment and grease th parchment.
    • In a medium bowl, whisk together the almond flour, whey protein, baking powder, and salt. Set aside.
    • In a large bowl, beat the sour cream with the sweetener until well combined. Beat in the eggs and vanilla extract. Add half of the almond flour mixture and beat until combined, then beat in the almond milk. Beat in the remaining almond flour until the batter is well combined. If it's very thick, add another tablespoon or two almond milk. It should be spreadable but not pourable.
    • In another large bowl, whisk the cocoa powder and hot water together until smooth. Add about ⅓ of the vanilla batter to the cocoa mixture and stir until well combined.
    • Add the two batters in small alternating dollops to the two pans and swirl with a knife, then smooth the tops. Bake 25 to 30 minutes, until the edges are set and the tops are just firm to the touch.
    • Remove and let cool completely in the pans, then flip out onto a wire rack and remove the parchment.

    Chocolate Swiss Buttercream Frosting

    • Set a heatproof bowl over a pan of barely simmering water. Add the chopped chocolate and stir until melted and smooth. Remove from over the pan and let cool while preparing the rest of the frosting.
    • Prepare the Sugar-Free Swiss Buttercream according to the directions. After all the butter has been added, set the mixer on low and drizzle in the melted chocolate until combined. You will need to stop the mixer and scrape the sides and bottom with a rubber spatula a few times to get all the chocolate mixed in.
    • Note: if your frosting is super soft after adding the chocolate, simply place in the fridge for about 5 to 10 minutes to firm up a little before frosting the cake.

    To assemble

    • Set one layer of cake on a serving platter and spread the top with about ⅓ of the frosting. Place the second layer on top and spread the top and sides with more frosting. There should be enough to pipe some rosettes on the top as well, if desired.
    • Decorate with mini keto cookies or small pieces of sugar-free chocolate. Or consider adding some sugar-free sprinkles!
    Nutrition Facts
    Marble Layer Cake
    Amount Per Serving (1 serving = 1/16th of cake)
    Calories 267 Calories from Fat 197
    % Daily Value*
    Fat 21.9g34%
    Carbohydrates 8.4g3%
    Fiber 4.1g16%
    Protein 9.6g19%
    * Percent Daily Values are based on a 2000 calorie diet.
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    Nutritional Disclaimer

    Please note that I am not a medical or nutritional professional. I am simply recounting and sharing my own experiences on this blog. Nothing I express here should be taken as medical advice and you should consult with your doctor before starting any diet or exercise program. I provide nutritional information for my recipes simply as a courtesy to my readers. It is calculated using MacGourmet software and I remove erythritol from the final carb count and net carb count, as it does not affect my own blood glucose levels. I do my best to be as accurate as possible but you should independently calculate nutritional information on your own before relying on them. I expressly disclaim any and all liability of any kind with respect to any act or omission wholly or in part in reliance on anything contained in this website.

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    1. Graciela says

      March 13, 2022 at 11:43 am

      Hello! I just made the cake and looks pretty nice, just wondering how to store it, fridge or room temperature?
      Thanks

      Reply
      • Carolyn says

        March 13, 2022 at 12:31 pm

        Cakes with frosting should always be refrigerated but I like to serve them at room temp for softer frosting.

        Reply
        • Graciela says

          March 13, 2022 at 5:23 pm

          Thanks Caroline! I will do that

          Reply
    2. Angela says

      July 23, 2021 at 10:34 pm

      This is my go-to cake. (Thank you). I have made into a two tier, vanilla icing, chocolate icing…and today a new twist. I had bought my husband a Lily’s Cookies and Cream white chocolate bar and used that instead of the 4 oz of chocolate in the icing. WOW! Thank you so much for sharing such reliable, delicious recipes!

      Reply
    3. Katy says

      December 22, 2020 at 7:00 pm

      Hi Carolyn,
      My son has requested marble cupcakes instead of a cake for his birthday! Any advice on how long to cook?

      Many thanks,
      Katy

      Reply
      • Carolyn says

        December 23, 2020 at 2:34 pm

        Just look at one of my other cupcake recipes as a rough guide.

        Reply
    4. Reba Gravelle says

      October 18, 2020 at 8:17 am

      We loved the keto marble cake, but the cake was a bit dry and crumbled too much when I frosted it. What did I do wrong? What can I add or change to make it cling together better? BTW, the Swiss meringue was awesome!

      Reply
      • Carolyn says

        October 18, 2020 at 8:26 am

        Sounds over-baked. What sweetener did you use?

        Reply
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