Keto Yule Log (Low-Carb Christmas Cake)
If you are looking for the perfect Keto Yule Log (or Bûche de Noël) to serve as your holiday centerpiece, you have found it. There is a quiet magic that happens in the kitchen during the holidays, and creating this stunning low-carb dessert is the perfect way to share that joy.
This Keto Yule Log captures all the wonder of the season without the sugar, making it the ultimate sugar-free Christmas dessert. I’ve chosen a classic Black Forest style for this showstopper: imagine a tender, flourless chocolate sponge rolled around a cloud of creamy mascarpone and bright, ruby-red cherries.
Finished with a rich ganache bark and a dusting of snowy sweetener, this low-carb Yule Log is an elegant masterpiece that whispers of forest fairytales. Yet, for all its sophistication, it is wonderfully simple to make.
The recipe requires:
13 Ingredients
Active cooking time: 40 minutes
Total cooking time: 9 hours
Table of Contents
Why you will love this!
Authentic “Black Forest” Flavor: We use a classic combination of chocolate sponge, creamy mascarpone filling, and a tart cherry compote.
Stunning Presentation: Covered in rich ganache “bark” and decorated with rosemary “branches” and almond “mushrooms,” it’s a true centerpiece.
Make-Ahead Friendly: This cake needs to set in the fridge overnight, making it the perfect stress-free dessert to prep before Christmas day.
Crowd-Pleaser: It’s so rich and decadent that your non-keto guests won’t even guess this keto Yule Log is sugar-free.
Keto Yule Log Recipe
Ingredients
Here is a closer look at the key ingredients and why I use them to make the perfect keto Yule Log.
For the Gluten-Free Chocolate Cake Sponge:
Eggs: These are the most critical ingredient. The structure comes primarily from the proteins in the eggs.
Powdered Sweetener: I recommend using powdered erythritol or a monk fruit blend. It dissolves instantly into the egg foam.
Unsweetened Cocoa Powder: Provides the deep chocolate flavor.
Almond Flour & Baking Powder: A small amount of almond flour and baking powder helps give the sponge a slightly more cake-like texture while keeping it airy.
Melted Butter: Added to the yolks for richness and moisture.
For the Filling:
Mascarpone Cheese: This Italian cream cheese is the secret to a stable filling. It creates a structure that supports the weight of the rolled keto Yule Log without deflating.
- Heavy Whipping Cream: You need cream with at least 33% fat content (often called double cream). It adds lightness to the mascarpone filling and richness to the ganache.
- Frozen Cherries: Frozen cherries are often better than fresh for this recipe because they are already pitted and tend to be juicier.
- Cornstarch: We use a tiny amount (just 1 teaspoon) to thicken the cherry juices into a glossy sauce. Without it, the juice would run into the sponge and make it soggy. The carb impact per slice is negligible, but the texture improvement is huge.
For the Decoration:
- Sugar-Free Dark Chocolate: Use your favorite brand of keto-friendly dark chocolate (like Lily’s or Lindt 85%+). This is melted down to create the “bark” coating.
- Garnish: We use powdered sweetener for “snow,” almond flakes to create rustic “mushrooms,” and rosemary or thuja sprigs to mimic pine branches for a festive forest floor look.
*you’ll find the exact measurements in the recipe card below.
Equipment
Here are the tools you’ll need:
Electric Hand Mixer or Stand Mixer: Essential for whipping the eggs to maximum volume for the sponge and for whipping the cream filling.
Silicone Baking Mat or Parchment Paper: You need a non-stick surface to bake the sponge on so it peels off easily for rolling.
Rubber Spatula
Mixing Bowls: You’ll need separate bowls for the egg whites and yolks, for whipping the creamy filling, and for the ganache.
Small Saucepan: For making the cherry sauce.
Instructions for Keto Yule Log
Step 1: The Cherry Center
It is best to prepare the cherry filling first, as it must be completely cool before assembly. Begin by simmering the frozen cherries in a saucepan until they release their juices. Strain the liquid, return the juice to the pan, and simmer briefly to concentrate the flavor.
To achieve a glossy sauce consistency, dissolve a teaspoon of cornstarch in a tablespoon of cold water and stir this slurry into the simmering juice. Continue stirring until the mixture thickens. Return the cherries to the pan, stir to combine, and set aside to cool completely.
Step 2: Make the Sponge Batter
Separate: Start by carefully separating the egg whites from the yolks into two large bowls.
Whip the Whites: Next, add a pinch of salt to the egg whites. Whip them until stable peaks form. Throughout this process, gradually add half of your powdered erythritol.
Whip the Yolks: Then, moving to the other bowl, combine the yolks with the remaining half of the powdered erythritol and melted butter. Whip this mixture until it lightens in color and increases slightly in volume.
Combine: Once both parts are whipped, gently fold the yolk mixture into the whipped whites using a spatula. Use a delicate bottom-up motion to ensure you keep as much air in the batter as possible.
Dry Ingredients: Finally, mix the cocoa powder, almond flour, and baking powder in a small bowl. Sift this dry mixture over your egg mass. Fold it in very carefully to preserve the airiness. The resulting batter should feel light and airy, just like a mousse.
Step 3: Bake
Once your batter is ready, gently pour it onto your prepared baking sheet. Use a spatula to spread it into an even layer, aiming for about 1 cm (scant 1/2 inch) in thickness.
Place the tray in the oven and bake for just 10–12 minutes. Keep a close eye on it because this is the critical moment – you do not want to overdry it.
As soon as the top springs back when pressed lightly with a finger, take it out immediately.
Step 4: The Roll
Unlike regular gluten sponge cakes, the sponge for this low-carb Yule Log is more fragile. We need to train it to roll while it’s hot.
Before you even take the cake out of the oven, have a clean kitchen towel or a fresh sheet of parchment paper ready on the counter.
As soon as the tray comes out, flip the hot sponge onto your prepared towel or parchment. Carefully peel off the paper it was baked on. Then, immediately roll the empty, hot sponge up along with the towel or parchment inside. Leave it to cool completely in this rolled shape to create “shape memory.”
Step 5: The Creamy Filling
While your cake is cooling in its roll, you can whip up the filling. In a chilled bowl, whip the heavy cream with a sweetener until soft peaks form.
Next, gradually add the mascarpone cheese and continue whipping until you have a smooth, stiff cream that holds its shape well. It should be lush and spreadable.
Step 6: Assemble & Set
When the sponge is completely cool to the touch, gently unroll it. Spread your luscious mascarpone cream evenly over the surface, and then spoon the cooled cherry filling randomly over the cream layer.
Using the bottom parchment or towel to assist you, roll the cake back up tightly into a log.
Wrap it securely in plastic wrap and place your keto Yule Log in the fridge overnight.
This resting time is essential as it allows the flavors to meld and the sponge to set perfectly.
Step 7: Decoration
The next morning, start by making your ganache. Melt the chocolate, cream, and butter together over a water bath until glossy and smooth. Let it cool on the counter until it thickens to a spreadable consistency.
While the ganache cools, take your log out of the fridge. First, trim both ends to create a nice, clean cut.
Next, create the realistic “branch” look. Cut a slice off one end first straight, and then slice this piece at a diagonal angle, removing the excess. Use a dab of your thickened ganache to stick this piece onto the side of the main log.
For the finishing touches, I like to lightly dust the log with cocoa powder for depth, then dust with powdered sweetener to create a snowy effect. Arrange almond flakes to look like little mushrooms growing on the log, add rosemary sprigs or thuja branches, and serve.
For the finishing touches, I like to lightly dust the log with cocoa powder for depth, then dust with powdered sweetener to create a snowy effect. Arrange almond flakes to look like little mushrooms growing on the log, add rosemary sprigs or thuja branches, and serve.
Enjoy this festive, low-carb slice of holiday magic!
Tips for a Perfect Keto Yule Log
Room Temperature Ingredients: Make sure your eggs are at room temperature before whipping. Cold eggs simply won’t reach the same volume, which is crucial for a fluffy, flourless sponge.
Roll While Hot: This is the secret to a crack-free keto roll. Shaping it while it is hot and flexible trains the “memory” of the sponge.
Don’t Overbake: This is the most common mistake. The sponge is thin and cooks very fast.
Ganache Success: Ensure your bowl and spatula are completely dry before melting the chocolate. Even a single drop of water can cause the chocolate to seize and become grainy. Also, avoid overheating; melt it gently.
Cool Completely: Ensure your cherry filling and ganache are completely cooled before assembling. Hot filling will melt the cream!
The Thickener: Even though cornstarch is a starch, we use such a tiny amount for the whole cake that the carb impact is negligible, but it guarantees a perfect, non-soggy texture.
Cracks Happen: If your cake cracks slightly while rolling, don’t panic! The thick ganache coating creates a beautiful bark texture that is perfect for hiding any imperfections.
Patience: Letting the keto Yule Log set overnight is the secret to clean slices.
Clean Cuts: For beautiful slices, wipe a knife after each cut.
FAQ
More keto Christmas recipes:
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Keto Yule Log (Low-Carb Black Forest Cake)
The perfect keto Christmas dessert. Light chocolate sponge, creamy filling, and tart cherries create a classic Black Forest flavor without the carbs. A beautiful gluten-free centerpiece.
Ingredients
For the Flourless Sponge:
- 5 large eggs (room temperature), separated
- 50 g (½ cup) powdered erythritol
- Pinch of salt
- 30 g (⅓ cup) unsweetened cocoa powder
- 20 g (1 ½ tbsp) butter, melted
- 30 g (⅓ cup) superfine almond flour
- 1/2 teaspoon baking powder
For the Mascarpone Filling:
- 200 g (scant 1 cup) heavy whipping cream (min 33% fat)
- 250 g (8.8 oz) mascarpone cheese
- 70 g (½ cup) erythritol
For the Cherry Filling:
- 200 g (1 ½ cups) frozen pitted cherries
- 1 teaspoon cornstarch
- 1 tablespoon water (cold)
- 50 g (¼ cup) erythritol
- Lemon and orange zest (optional)
For the Chocolate Ganache:
- 70 g (2.5 oz) sugar-free dark chocolate, chopped
- 70 g (⅓ cup) heavy whipping cream
For Decoration:
- Powdered erythritol (for snow)
- Cocoa powder (for dusting)
- Almond flakes
- Thuja or rosemary sprigs
Instructions
- Make Cherry Filling: Simmer cherries in a saucepan until they release their juice. Strain the liquid, return juice to the pan, and simmer to reduce slightly. Dissolve cornstarch in the 1 tbsp cold water. Pour into the simmering juice, stirring constantly until thickened. Add cherries back in and allow to cool completely.
- Prep: Preheat oven to 180°C (350°F). Line a standard rectangular baking tray with a silicone mat or parchment paper.
- Separate & Whip Whites: Separate the eggs. Whip the egg whites with a pinch of salt until stable peaks form. Gradually add half of the powdered erythritol while whipping.
- Whip Yolks: In a separate bowl, whip the egg yolks with the remaining half of the erythritol, and melted butter until the mixture lightens and increases slightly in volume.
- Combine: Gently fold the yolk mixture into the whipped whites using a spatula, moving from bottom to top.
- Add Dry Ingredients: In a small bowl, mix the cocoa powder, almond flour, and baking powder. Sift this into the egg mixture. Fold in very gently to preserve the air bubbles. The batter should feel like a mousse.
- Bake: Spread the batter evenly onto the prepared tray (approx. 1 cm (scant ½ inch) thick). Bake for 10–12 minutes. Do not overbake or it will become brittle. Remove as soon as the top springs back when pressed.
- Roll Hot: Prepare a clean towel or parchment. Flip the hot cake onto it and peel off the baking paper. Roll the empty hot cake up with the towel inside. Let it cool completely in this rolled shape to create "shape memory."
- Make Cream Filling: Whip heavy cream with erythritol until soft peaks form. Gradually add the mascarpone cheese and whip until smooth and stiff peaks form.
- Assemble: Spread the mascarpone cream evenly over the cooled sponge cake. Spoon the cooled cherry filling randomly over the cream layer.
- Roll & Set: Using the bottom parchment paper for support, tightly roll the cake into a log. Wrap the log in plastic wrap or parchment paper and refrigerate overnight to set.
- Make Ganache: The next day, combine the chocolate and heavy cream in a heatproof bowl. Melt over a water bath until glossy and smooth. Let cool slightly to thicken.
- Decorate: Trim both ends of the log for a clean cut. To create a branch, cut a slice off one end at a diagonal angle and attach it to the side using a dab of ganache. Spread the remaining ganache over the log and branch. Use a fork to create a bark texture.
- Finish: Lightly dust with cocoa powder, then powdered sweetener for a snow effect. Insert almond flakes to resemble mushrooms and garnish with rosemary or thuja sprigs.
Notes
Room Temperature Eggs: This is critical. Cold eggs will not whip to the volume needed for a flourless sponge.
Ganache Tip: Ensure your bowl and spatula are completely dry before melting chocolate. Even a drop of water can cause it to seize.
Storage: Store leftovers in the refrigerator for up to 4 days.
Nutrition Information:
Yield: 10 Serving Size: 1Amount Per Serving: Calories: 316Total Fat: 29gCarbohydrates: 9.5gNet Carbohydrates: 5.9gFiber: 3.6gSugar: 3.8gProtein: 6.7g
The nutritional information provided is an estimate calculated using online tools and the specific brands I used. Carb counts exclude sugar alcohols (erythritol). Your values may vary depending on the specific ingredients and brands you use.